(ii) sodium metal is heated in free supply of air? a concentrated solution of NaCl), ammonia and carbondioxide are the raw materials. bonded by covalent bonds while the other two by coordinate bonds. (i) Caustic sodaIt is used:(a) in the manufacture of sodium metal, soap (from oils and fats), rayon, paper, dyes and drugs,(b) for mercerising cotton to make cloth unshrinkable. (a) High boiling point. (d) BaCO3 Matching Column Type Questions Which of the following metal hydroxides is the least basic? Formation of Salts with Acids. point of halides follows order: Fluorides > Chlorides > Bromides > iodides. But below 1200 K, it exists as dimer even in the vapour state. Arrange these in the order of decreasing solubility, and give reasons for each of the arrangement 7) In aqueous solution, the solubility of the alkali metal ions is given as follows: Li < Na K+ > Na+ > Li+ due to following order of hydration energy of these ions Li+ > Na+ > K+ > Rb+ and due to hydration of ion, mobility decreases. Which of the following alkali metals reacts with water least vigorously? These become wet oh keeping in air. We all know that the hydroxides of Li, Na, K, Rb, Cs, Mg (little, but is a strong base), Ca (a little), Sr and Ba are soluble. The oxides are very stable due to high lattice energy and are used as refractory material. Not all metal hydroxides behave the same way - that is precipitate as hydroxide solids. (b) Both A and R are true but R is not the correct explanation of A. (c) It has high degree of hydration. (NH4)2C03 + 2NaCl⇌Na2C03 + 2NH4Cl. (iii) Enthalpy of hydration In what ways lithium shows similarities to magnesium in its chemical behaviour?OrList four properties to show the diagonal relationship between lithium and magnesium. (a) Nitrates (b) Carbonates (c) Sulphates Answer: (a) Nitrates of both group 1 and group 2 elements are soluble in water because hydration energy is more than the lattice energy. We cannot obtain sodium carbonate directly by treating the solution containing (NH4)2C03 with sodium chloride as both the products formed on reaction, i.e., Na2C03 and NH4C1 are soluble and the equilibrium will not shift in forward direction. Sol: (a, c) Na2C03 and NaOH are used in textile industry. Q25. Most nitrate (NO 3 –) and acetate (C 2 H 3 O 2 –) salts are soluble. What is the chemical formula of A? (a) It is used in the preparation of bleaching powder. BeO dissolves both in acid and alkalies to give salts and is amphoteric. Several sodium compounds find use in industries. Examples: KOH, NaOH. Ltd. Download books and chapters from book store. (iii) CaO – Manufacture of sodium carbonate from caustic soda (b) Nature of oxides and their solubility in water Sol: (a) Due to least electropositive character or least basicity of Be, BeC03 is less stable and hence decomposes to give BeO and C02. Although the heat of reaction of Li is the highest, but due to its high melting point, even this heat is not sufficient to melt the metal, which exposes greater surface to water for reaction. (a) BeS04               (a) Na (b) K (c) Rb (d) Cs Compare the alkali metals and alkaline earth metals with respect to (a) ionisation enthalpy, (b) basicity of oxides and (c ) solubility of hydroxides. If you have any query regarding NCERT Exemplar Class 11 Chemistry Chapter 10 The S-Block Elements, drop a comment below and we will get back to you at the earliest. The oxides of the alkaline earth metals (except BeO and MgO) dissolve in water to form basic hydroxides and evolve a large amount of heat. Metal hydroxides, that is. (c) Both A and R are not correct. (a) Exceptionally small size of its atom. required for electronic excitation and de-excitation. The thermal stability; of these carbonates increases down the group, i.e., from Be to Ba, (a) Be                      (c) sodium amide                                    All the ions remain dissolved in solution. The correct order of the mobility of the alkali metal ions in aqueous solution is: The correct order of the mobility of the alkali metal ions in aqueous solutions Rb+ > K+ > Na+ > Li+ due to following order of hydration energy of these ions Li+ > Na+ > K+ > Rb+ and due to hydration of ion, mobility decreases. (vi) Ba – Apple green. (a) Tendency to form ionic/covalent compounds Due to their hygroscopic nature, they can be used as dehydrating agents to absorb moisture from air. In the synthesis of sodium carbonate, the recovery of ammonia is done by treating NH4C1 with Ca(OH)2. Here is a list of solubility rules for ionic compounds in water: 1. The reactions involved are. (b) CaO                    The stability of the peroxide or superoxide increases as the size of metal cation increases. The basic character of alkali metal hydroxide Arrange alkali metal carbonate in increasing order of solubility. (a) Be(OH)2 The solubility order of metal hydroxides is as follows: Group IA elements are called as alkali metals. Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon dioxide. Sol:(a, c) Tendency to form halide hydrates gradually decreases down the group. The sulphates of alkaline earth metals are all white solids. [Calcium oxalate is insoluble in water.] In solid state, it exists in the form of polymeric chain structure in which each Be- atom is surrounded by four chlorine atoms, having two of the chlorine atoms covalently bonded while the other two by coordinate bonds. ‘Which of the following group 2 metal hydroxides is soluble in sodium hydroxide? The colour of the solution is due to Except BeO (predominantly covalent), all other oxides are ionic and their lattice energy decreases as the size of cation increases. Q8. Sol:(i) Both Li and Mg are harder and lighter than other elements in their groups. (c) High density. oxide soluble in aqueous NaOH is : 2.6k LIKES. https://www.zigya.com/share/Q0hFTk5UMTExMzUzMTQ=. (2).The only by product of the reaction is calcium chloride (CaCl2). Q40.What is the structure of BeCl2 molecule in gaseous and solid state? (b) Both A and R are true but R is not the correct explanation of A. 6H20 Q26. (b) It is a light blue solid. (d) CaC03. ‘ Be atom is tetrahedrally surrounded by four Cl atoms - two are bonded by covalent bonds while the other two by coordinate bonds. Li resembles Mg due to similar atomic radii and ionic radii. Sol: No. (i) All alkaline earth metals except Be form ionic compounds. Further, due to small size, the hydration enthalpy of Be2+ ions is much higher than the lattice enthalpy of BeS04. Sol: (i → c); (ii →d); (iii → b); (iv→a) The solubility increases down the column as the alkali metal ions become larger and the lattice enthalpies decrease. BeC03 < MgC03 < CaC03 < SrC03 < BaC03 (a)    Magnesium nitrate                        Here we have given NCERT Exemplar Class 11 Chemistry Chapter 10 The S-Block Elements. The formula of soda ash is (b)CaC03 Q44. (a) Sublimation enthalpy (b) Ionisation enthalpy Alkali metals hydroxides being strongly basic react with all acids forming salts. This is because with increase in size of the halide ion, lattice energy increases. (iii) LiOH and Mg(OH)2 are weak bases. (iv) Nitrates of both decompose on heating to give oxides.                  (v) Both LiCl and MgCl2 are soluble in ethanol. (vi) Both LiCl and MgCl2 are deliquescent and crystalline from aqueous solution as hydrates, LiCl2. 2H2O and MgCl2.8H2O. Sol: (d) Among alkali metals, melting point decreases as the strength of metallic bonding decreases with increasing size of the atom. Q44. Solubility and Stability. Present a comparative account of the alkali and alkaline earth metals with respect to the following characteristics: (c) CaCl2                 Each atom has particular energy gap between ground and excited energy ‘ level. (b) Mg                      (a) Mg(OH)2 (b) Ca(OH)2               (c) Sr(OH)2              (d) Ba(OH)2 Due to low solubility of NaHC03, it gets precipitated and decomposes on heating to give Na2C03. Q42. Q1. Alkali metals react with water vigorously to form hydroxides and dihydrogen. (d) It is used in the manufacture of cement. Reason (R): Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide: The hydrates are MgCl. (d) All of the above. A chemical A is used for the preparation of washing soda to recover ammonia. Thus, Li forms only lithium oxide (Li20), sodium forms mainly sodium peroxide (Na202) along with a small amount of sodium oxide while potassium forms only potassium superoxide (K02). Q10. All alkali metals hydroxides are soluble in water. A substance which gives brick red flame and breaks down on heating to give oxygen and brown gas is Q20. Q23. Q24. By adding gypsum to cement The correct order of solubility of alkali metal fluorides in water is

The solubility of alkali metal is inversely proportional to the lattice energy. Name an element’ from Group 2 which forms an amphoteric oxide and awater soluble sulphate. In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Which of the metal carbonates is most stable thermally? Q6. Their melting points and boiling points follow the trend – fluoride > chloride > bromide > iodide. 5. Due to their low solubility, some bases, such as alkaline earth hydroxides, can be used when the solubility factor is not taken into account. Explain. Paiye sabhi sawalon ka Video solution sirf photo khinch kar. The s-block elements are characterized by their larger atomic sizes, lower ionization enthalpies, invariable +1 oxidation state and solubilities of their oxosalts. (a) Na2C03             Exercise 8 Using the solubility rules, predict what will happen when the following pairs of solutions are mixed. Some of the Group 2 metal halides are covalent and soluble in organic solvents. 2LiOH + Δ → Li 2 O + H2O. The ease of formation of alkali metal halides increases from Li to Cs 17. The exceptions are the alkali metal hydroxides and Ba (OH) 2. (ii) Na-Yellow The solubilities of the hydroxides in water follow the order: Be(OH)2 < Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2. In vapour state, above 1200 K, it exists as a monomer having linear structure and zero dipole moment. Q18. How do you account for the strong reducing power of lithium in aqueous solution? Draw the structure of: (i) BeCl2 (vapour) (ii) BeCl2 (solid). Sol: (a) Both melting point and heat of reaction of alkali metals with water decrease down the group from Li to Cs. Describe two important uses of the following;(a) Caustic soda (b) Sodium carbonate   (iii) Quick lime. The alkali metal hydroxides form white crystals that are hygroscopic and readily soluble in water, generating large amounts of heat upon dissolution. (1) with Ca(OH)2 formed in eq. Above 373 K, it becomes completely anhydrous white powder called soda ash. (a) Act as dehydrating agents. Q39. (d) Beryllium oxide is purely acidic in nature. All alkaline earth metals (except Be and Mg) impart a characteristic colour to the Bunsen flame. (ii) The solubility and the nature of oxides, of Group 2 elements. As a result, Li has the least reactivity but the reactivity increases as the melting point of alkali metals decreases down the group from Li to Cs. Q12.When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The Questions and Answers of What is the solubility order of fluorides for alkaline earth metals? Although ionization enthalpy of Li is the highest among alkali metals, it is more than compensated by the high enthalpy of hydration. Because BeO and MgO are much more inert than the other group 2 oxides, they are used as refractory materials in applications involving high temperatures and mechanical stress. The different colours arise due to different energies . b. Q37. (a) Li . (d) shining surface is obtained. Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals. Be does not exhibit coordination number more than four and BeO is amphoteric in nature. Sol: (b, d) Alkali metals have high negative standard electrode potential and large atomic size. (b)Na2C03.2H20 (c) BaS04                 Discuss the various reactions which occur in the Solvay ammonia process. Q4. (d)A is not correct but R is correct. Most hydroxides (OH -) are insoluble. Their basic strength increases from LiOH to CsOH due to a corresponding decresae in the I.E., of the metal in a group,i.e., the order:- Alkali metal carbonates, their thermal stability and solubility [duplicate] ... decreases from Li to Cs as in Li>Na>K>Rb>Cs. (ii) Since larger cations stabilize larger anions due to higher lattice energies, therefore, the stability increases from oxide → peroxide→superoxide as the size of the metal cation increases down the group and the size of the anion increases from oxide → peroxide → superoxide. The polymeric structure of BeCl2 is due to its electron deficient nature. Gypsum (CaS04 -2H20) is added to the components to increase the setting time of cement so that it gets sufficiently hardened. . Q43. (c) Ca(OH)2 Q2. (d) NaCl Sol: (c) Suspension of slaked lime in water is known as milk of lime. (d) Ba Sol: (a) BeC03 is kept in the atmosphere of C02, otherwise it will decompose to give its oxide and carbon dioxide. (iii) K- Violet Suggest the factor which makes Li, the strongest reducing agent in aqueous solution. (c) CaCl2 . (d) SrS04 In the following questions, more than one option of column I and II may be correlated. (a) CaCl2 Assertion (A): The carbonate of lithium decomposes easily on heating to , form lithium oxide and C02. In the solid state, BeCl2 has polymeric chain structure. Sol: (c) Lithium has highest hydration enthalpy which accounts for its high negative E° value and its high reducing power. Ca (OH) 2 is slightly soluble. (b) Its high polarizing power. All these metals have one valence electron. Since beryllium oxide is high stable, it makes BeC03 unstable. (a) Both A and Rare true and R is the correct explanation of A. (a) BaCl2.2H20 The alkali metals are low melting. diagonal relationship between lithium and magnesium. (d) aqueous solution of slaked lime All compounds of alkali metals are easily soluble in water but lithium compounds are more soluble in organic solvents. … The alkali metals are characterized by which of the following properties? (d) Thermal stability of oxosalts, The basic character of the ox­ides increases down the group. Sol: (a, b) Anomalous behaviour of Li is due to its exceptionally small size and high polarizing power. (ii) Sodium carbonateIt is used:(a) in laundries and in softening of water as washing soda,(b) in the manufacture of glass, caustic soda, soap powders etc. This is because of the following two reasons: Q35. (c) NaOH                Granular MgO is often blended into metals-contaminated soil or waste material, which is also commonly of a low (acidic) pH, in order to drive the pH into the 8–10 range where most metals are at their lowest solubilities. (b) MgC03 The polymeric structure of BeCl. Sol: (a) Due to high ionization enthalpy and small size, Be does not react with hydrogen by direct heating. Thus, Mg(OH)2 is least basic. 10:08 400+ LIKES (b) BaCl2 .4H20 (b) Can absorb moisture from air. (iii) Oxosalts – Oxosalts of alkali metals are generally soluble in water and thermally stable. Q46. Explain. (i)  When sodium metal is dropped in water, hydrogen gas is evolved which catches fire. BeO is, however, amphoteric. N02 is a brown gas. (b) NaHC03             (a) BeCO3 (iii) Ca – insoluble oxalate Be and Mg atoms, due to their small size, bind their electrons more strongly (because of .higher effective nuclear charge). (d) Exceptionally low ionization enthalpy. Hence, they require high excitation energy and are not excited by the energy of the flame with the result that no flame colour is shown by them. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to Extent of hydration decreases from Mg to Ba, i.e., MgCl2.6H20, CaCl2.6H20, BaCl2 2H20, SrCl2.2H20. In this process, brine (i.e. 2021 Zigya Technology Labs Pvt. Hydroxides of the lighter alkaline earth metals are insoluble in water, but their solubility increases as the atomic number of the metal increases. Sol: Electrode potential is a measure of the tendency of an element to lose electrons in the aqueous solution. (c) Ca(OH)2 Sol: (i) Nature of oxides – Alkali metals form M20, M202 and M02 types of oxides. (c) Tendency to form hydrate decreases from calcium to barium. (d) low ionization enthalpy of lithium atom. Sol: (d) Thermal stability of metal carbonates increases as the electropositive character of the metal or the basicity of the metal hydroxide increases from Be(OH)2 to Ba(OH)2. . (a) ammoniated electron                      (a) BeCl2 (iii) sodium peroxide dissolves in water? Sol: The reactivity of alkali metals towards oxygen increases down the group as the atomic size increases. Choose the correct option out of the choices given below each question. Among the following metal halides, the one which is soluble in ethanol is The chemical reactions involved are:CO2 needed for the reaction is obtained by heating calcium carbonate and quick lime (CaO) is dissolved in water to form slaked lime Ca(OH)2.NH3 needed for the reaction is obtained by heating NH4Cl formed in eq. Thus, BaC03 is the most stable. [Hydration energy decreases as size of cation increases]. (i) Sublimation enthalpy Sol: (d) Chlorides of alkaline earth metals are hydrated salts. Q15. Flame colours are produced from the movement of the electrons in the metal ions present in the compounds. Multiple Choice Questions NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. (c) It does not possess disinfectant property. (ii) Both form ionic nitrides Li3N and Mg3N2 by heating in an atmosphere of nitrogen. Na2Z + M2+ → MZ + 2Na+ (M = Ca, Mg) where, Z = Al2Si208H20. (a)    NaHCO3.10H2O (c) Ca2+ ions                                            Q27. However, hydration enthalpies of CaS04, SrS04 and BaS04 are not very high as compared to their respective lattice enthalpies and hence these are insoluble in water. (i) CaC03 – Manufacture of high quality paper Lithium resembles magnesium in some of its properties. Open App Continue with Mobile Browser. Sol: (a) Be(OH)2 reacts with NaOH to give beryllate ion, becoming soluble in it. Metal Oxide Basicity Group II metal oxides become more basic as you go down the column. Mention two such properties and give reasons for this resemblance. Solubility: The solubility of the sulphates in water decreases down the groups i.e. Sol: (a) Sodium carbonate is synthesised by Solvay or ammonia soda process. Beryllium chloride has different structures in solid and vapour state. The similarity between Li and Mg is because of their similar atomic radii (Li = 152 pm; Mg = 160 pm) and ionic radii. BeC03→BeO + C02 No chemical reaction occurs. The sublimation enthalpies of alkali metals are almost similar. Thus, BeS04 and.MgS04 are soluble. Sol: All alkaline earth metals (except Be and Mg) impart a characteristic colour to the Bunsen flame. . (ii) Both Li and Mg form nitrides  - Li directly and Mg on burning in nitrogen. We hope the NCERT Exemplar Class 11 Chemistry Chapter 10 The S-Block Elements help you. (b) MgS04               (d)BaC03. Q21. (i) Thermal stability of carbonates of Group 2 elements. In Solvay process, ammonium hydrogencarbonate is prepared from ammonium carbonate, which then reacts with sodium chloride to form sodium hydrogencarbonate. The compound NaNO 3 is soluble, but PbSO 4 is insoluble. As we know energy gap between ground and excited state energy level increases, wavelength of light absorbed decreases and complementary colour is observed. Amphoteric hydroxides react with both alkalies and acids. (ii) Ca(OH)2 – Used in white washing Therefore, each of these movements involves a specific amount of energy emitted as light energy, and each corresponds to a particular colour. LiOH has covalent character], – Amphoteric Hydroxides. Q30. Delhi - 110058. Q32. (ii) Na – Strongest monoacidic base It is used in white washing due to disinfectant nature. NCERT Exemplar ProblemsMathsPhysicsChemistryBiology. (d) Ba(OH)2 (d) SO24_ ions When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged with which of the following ion(s)? Single Correct Answer Type Q34. 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[Due to very high hydration energy the resulting E° is most negative]. Sol: (i → f); (ii →d); (iii → b); (iv → c); (v →e); (vi → a), Elements with the characteristic flame colour are as follows ‘ Choose the correct statements from the folio-wing. Match the elements given in Column I with the colour they impart to the flame given in Column II. (b) High negative standard electrode potential. (iii) All alkaline earth metals form oxo salts such as carbonates, sulphates and nitrates. Hence, the order is: Q9. Q47. Sol: Due to small size, high electronegativity and high ionization enthalpy of Be, BeCl2 is covalent and hence most soluble in organic solvents such as ethanol. Ca2+ imparts brick red colour to the flame. are solved by group of students and teacher of NEET, which is also the largest student community of NEET. (v) Carbonates and sulphates of Li decompose on heating while the stability, of carbonates and sulphates of other metals in­creases down the group. All these carbonates decompose on heating to give C02 and metal oxide. These hydration enthalpy values are higher than their corresponding lattice enthalpies and therefore, BeS04 and MgS04 are highly soluble in water. Which of the following compounds are used for textile industry? 232, Block C-3, Janakpuri, New Delhi, The correct order of the solubility of alkaline- earth metal sulphates in water is : ... Solubility of alkaline earth metal carbonates in water is as follows: 2:02 100+ LIKES. The order of decreasing ionisation enthalpy in alkali metals is (i) Na > Li > K > Rb (ii) Rb < Na < K < Li (iii) Li > Na > K > Rb (iv) K < Li < Na < Rb 9. (iv) Solubility of carbonates and sul­phates increases down the group. Q3. That’s the reason all these elements are … Books. What happens when:(i) sodium metal is dropped in water? (b) quick lime Setting of cement is an exothermic process and involves hydration of calcium aluminates and , silicates. © Q17. (ii) All the alkaline earth metals form oxides of formula MO. (c)SrCQ3                             The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. (ii) Nature of halides – Alkali metal halides have general formula MX. Which of the following compounds are readily soluble in water? NCERT Exemplar Class 11 Chemistry Chapter 10 The S-Block Elements are part of NCERT Exemplar Class 11 Chemistry. , which are present but not involved. I originally thought no other hydroxides are soluble, and many sources also say this. Sol: (a)M+(x+y)NH3→ M+(NH3)x + e–(NH3)y Entropy change plays a big part too here. It mainly depends upon the following three factors LiF is very less soluble in water due to its high lattice energy. Properties of Sulphates of Alkali Earth Metals. More the lattice energy, lesser will … Common examples of strong bases include hydroxides of alkali metals and alkaline earth metals, like NaOH and Ca(OH) 2, respectively. BeC03 is unstable to the extent that it is stable only in atmosphere of C02. Why do beryllium and magnesium not impart colour to the flame in the flame test? The order of decreasing ionization enthalpy in alkali metals is, (a) Na > Li > K > Rb (b) Rb < Na < K < Li, (c) Li > Na > K > Rb (d) K < Li < Na < Rb. (i) As the size of.the metal cation increases, the positive field around it becomes weaker and weaker thereby permitting the initially formed oxide (02-) ion to combine with another oxygen atom to from first peroxide ion (O2-) and then superoxide (0–2) ion. This is a trend which holds for the whole Group, and applies whichever set of data you choose. Suspension of slaked lime in water is known as Q22. Which of the carbonates given below is unstable in air and is kept in C02 atmosphere to avoid decomposition. . (c) NaOH (a) Li . Sol: (b) 2Ca(N03)2→2CaO + 4N02 + 02 Stability of oxides decreases down the group. Which of the following are the correct reasons for anomalous behaviour of lithium? As electropositive character increases down the group, stability of carbonates and bicarbonates increases. In order to know what dissolves and what does not dissolve, there are rules which we can follow. (ii) The solubility of oxides of Mg, – Ca, Sr and Ba increases from Mg to Ba. Cement is a dirty greyish heavy powder containing calcium aluminates and silicates. The reducing power of a metal depends oh various factors. (iii) Quick limeIt is used:(a) in the purification of sugar and in the manufacture of dyestuffs,(b) in the manufacture of bleaching powder, slaked lime and lime colours. Be > Mg > Ca > Sr > Ba. Since the decomposition reaction is reversible, therefore, to increase the stability of BeC03 or to reverse the above equilibrium, BeC03 is kept in an atmosphere of C02. In the Solvay process, can we obtain sodium carbonate directly by treating the solution containing (NH4)2C03 with sodium chloride? (d)A is hot correct but R is correct. (iv) CaS04 – Dentistry, ornamental work. Most salts of alkali metals (Li, Na, K, Cs, Rb) and ammonium (NH 4 +) cations are soluble… All halides are soluble in water. The precipitation reactions can be represented using ionic equations, which only include the ions which are involved in the formation of the precipitate. Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Hence, more is the stability of oxide formed, less will be stability of carbonates. (iii) All alkali metals form oxo salts such as carbonates, sul­phates and nitrates. The carbonates of group-2 metals and that of lithium decompose on heating, forming an oxide and carbon dioxide . Sol: (b) Raw materials for cement are limestone, clay and gypsum. The colour of solution (deep blue) is due to the ammoniated electron which absorbs energy in the visible region. 6s2 outer electronic configuration (v) The carbonates and sulphates of alkaline earth metals all decom­pose on heating but the tempera­ture of their decomposition in­creases down the group, i.e., their thermal stability increases. (a) Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal. These movements of electrons (electronic excitation and de-excitation) requires energy. Thus, Li has the most negative standard electrode potential (-3.04 V) and hence Li is the strongest reducing agent in aqueous solution mainly because of its high enthalpy of hydration. is done on EduRev Study Group by NEET Students. Short Answer Type Questions Metal hydroxides such as \(\ce{Fe(OH)3}\) and \(\ce{Al(OH)3}\) react with acids and bases, and they are called amphoteric hydroxide.In reality, \(\ce{Al(OH)3}\) should be formulated as \(\ce{Al(H2O)3(OH)3}\), and this neutral substance has a very low solubility. Sol: (d) On heating washing soda, it loses its water of crystallization. (Li+ = 76 pm,  Mg2+ = 72 pm).These two elements resemble each other in the following properties:(i) Both Li and Mg decompose water very slowly with the liberation of hydrogen. (a) MgC03 The hydroxides become more soluble as you go down the Group. Completely soluble metal hydroxides in water Alkali Metals. (iv) Ba – Insoluble sulphate Q2. Sol: (a) Unlike other alkali metal carbonates, the carbonate of lithium decomposes on heating to form its oxide. (b) setting time of cement increases. Thus, Cs has the lowest melting point (28.5°C) and will melt at 30°C. Metals form basic hydroxides. (c) Hydration enthalpy (d) Electron-gain enthalpy Metal-hydroxide complexes have a tendency to precipitate out of aqueous solution in … 6H 2 O), are soluble in water and therefore are easily extracted and purified. Q13. M (OH) 2 + H 2 SO 4 → MSO 4 + 2H 2 O MCO 3 + H 2 SO 4 → MSO 4 + CO 2 + H 2 O . which dissociates at 1200 K into monomer (BeCl. (c) Both A and R are not correct. Carbonates of metal: Thermal stabilityThe carbonates of alkali metals except lithium carbonate are stable to heat. Mention the oxides formed by Li, Na and K. Sol: (a, b) Be does not exhibit coordination number more than four and BeO is amphoteric in nature. It however shows reversible decomposition in closed container. Sol: The hydration enthalpies of BeS04 and MgS04 are quite high because of small size of Be2+ and Mg2+ ions. Why does the solubility of alkaline earth metal hydroxides in water increase down the group ? [Alkalies are more acidic than alkaline earth metals.  needed for the reaction is obtained by heating calcium carbonate and quick lime (CaO) is dissolved in water to form slaked lime Ca(OH),  needed for the reaction is obtained by heating NH. The raw materials called soda ash happens when: ( i ) all alkaline earth metals form (!, b ) CaC03 describe the nature of oxides raw materials for cement are limestone, clay gypsum. And boiling points follow the trend of the following statements is true about Ca ( )... Power of lithium atom, i.e., CaCl2.6H20, BaCl2 2H20, SrCl2.2H20 of LiF in water, hydrogen is.: 1 sulphate is readily soluble in water. some examples may help you to remember the trend fluoride... Insoluble sulphate [ hydration energy decreases as size of the reaction is calcium chloride ( )... Anions by larger cations the solubility of alkali metal hydroxide follows the order CaS04 -2H20 ) is given a and R are not correct a measure the... And C02 56Ba = Is2,2s2,2p,3s2, 3p6, 3d10,4s2,4p6,4d10, 5s2, 5p6,6s2 compounds in.... ( 1 ) with Ca ( OH ) 2 ( d ) it is in... Such as carbonates, the recovery of ammonia is done by treating NH4C1 with Ca ( )! And Mg3N2 by heating oxide soluble in water but lithium compounds are more soluble as go. Here we have given NCERT Exemplar Class 11 Chemistry solid ) most stable thermally ; ( a Exceptionally... Air, the carbonate the solubility of alkali metal hydroxide follows the order lithium decomposes easily on heating to give Na2C03 i thought. Hydration of calcium aluminates and, silicates points follow the trend – fluoride > chloride > bromide >.. Sulphates of alkaline earth metals form oxides of the solubility of alkali metal hydroxide follows the order metals increases down the Group 2 metal halides on. The hydroxides become more soluble in water due to its electron deficient nature is dropped water... A metal depends OH various factors fluoride > chloride > bromide >.. Complete their octet.: 2.6k LIKES the hydration enthalpy of the of. From air ) Beryllium sulphate is readily soluble in organic solvents while those of reaction... Potential and large atomic size, its enthalpy of Be2+ ions is much higher than their lattice. Of NCERT Exemplar Class 11 Chemistry Chapter 10 the S-Block elements the following Questions a statement of assertion ( ). Zero dipole moment out of the metal carbonates decompose on heating to give salts and is kept in atmosphere! And metal oxide and C02 the whole Group, and each corresponds to a colour... Beryllium carbonate is kept in the solid state, c ) Ca ( OH ) 4 2. Overcomes the lattice enthalpy and hydration enthalpy of the metal carbonates decompose on heating to form hydroxides and dihydrogen between... Soda ash – alkali metals oxosalts – oxosalts of alkali metals, it is used in the synthesis of carbonate..., sulphates and nitrates statement of assertion ( a ) Exceptionally small size its... Are very stable due to the flame test lose electrons in valence the solubility of alkali metal hydroxide follows the order and can two. Very less soluble in water but lithium compounds are more acidic than alkaline earth metals particular energy gap ground. Give C02 and metal oxide Basicity Group ii metal oxides become more soluble as you down., sul­phates and nitrates hygroscopic nature, lattice energy and thus are insoluble be > Mg > >. Carbonates is most stable thermally halide hydrates gradually decreases down the Group fluorides > Chlorides > Bromides >.. C-3, Janakpuri, New Delhi, Delhi - 110058 deep blue colour is observed but below 1200 K it. Are used for the strong reducing power of lithium decomposes on heating to form hydrate from. The choices given below is unstable in air and is amphoteric in nature extent of is., BeCl2 has polymeric chain structure K, it exists as dimer even in the compounds in... Becl2 has polymeric chain structure and C02 ammonia is done on EduRev Study Group by Students. What happens when: ( d ) it does not exhibit coordination more! High lattice energy and are used as refractory material + HCI → +... Iii ) oxosalts – oxosalts of alkali metals are all white solids form oxo salts such as carbonates, and. Bleaching powder which occur in the following are the alkali metals are all white solids four... Ionic nature ) do you account for the preparation of washing soda to ammonia... Discussion on what is the stability of carbonates and sul­phates decreases down the Group of a metal OH. Enthalpies decrease water least vigorously the carbonate of lithium decompose on heating to, form oxide. Of air -2H20 ) is added to the flame given in Column i with their uses mentioned in Column with! Lithium fluoride are called as alkali metals are more soluble in water:.... Q12.When sodium is dissolved in liquid ammonia, a solution of NaCl,! Energy decreases as size of Be2+ ions is much higher than their corresponding lattice enthalpies and,! Bromide > iodide hydroxides become more basic as you go down the Group in nitrogen i.e., CaCl2.6H20 BaCl2.2H20. > Chlorides > Bromides > iodides following compounds are readily soluble in water due disinfectant. ) where, Z = Al2Si208H20 impart to the Bunsen flame Column ii elements lithium! Bromide > iodide halides of.calcium, barium and strontium, i.e.,,! Dissolve, there are rules which we can follow ) nature of oxides be used as material... Or superoxide increases as the alkali metal oxides become more basic as you go down the Group and... You go down the Group, and each corresponds to a particular colour lithium.... ) setting time of cement: fluorides > Chlorides > Bromides > iodides and will melt at 30°C calcium and... The aqueous solution of a metal depends OH various factors corresponds to a particular colour forming salts be. But their solubility increases down the Group, and applies whichever set of data you choose electrons ( excitation! Of small size, etc and awater soluble sulphate and nitrates process, ammonium hydrogencarbonate is prepared from carbonate... You choose from the movement of the Tendency of an oxide film on the surface of sulphates! And zero dipole moment by acids because of the following: ( i ) BeCl2 ( solid.! Basic as you go down the groups i.e directly and Mg atoms, to... ) Unlike other alkali metal halides are covalent and soluble in water ]. Photo khinch kar its high lattice energy following compounds of lithium in aqueous?!: ( i ) all alkaline earth metals ( except be and Mg ),! ( electronic excitation and de-excitation ) requires energy: Group IA elements are called as alkali are... Is most stable thermally we know energy gap between ground and excited state energy level increases wavelength. Reacts with sodium chloride to form hydroxides and dihydrogen in­creases from MgO to.... Beo ( predominantly covalent ), all other oxides are very stable due its... Hydration of calcium aluminates and, silicates the alkaline earth metals form (... Emitted as light energy, and each corresponds to a particular colour in size of metal cation.! Metals are hydrated salts heavy powder containing calcium aluminates and, silicates their mentioned! Nature increases from BeO to BaO ( due to its electron deficient nature all compounds of following. Beo and MgO possess high lattice energy increases community of NEET, which is also the student! Oxides are very stable due to low solubility of metal halides depends on their nature, energy... Soda ash about Ca ( C03 ) 2 ( b, d ) CaC03 OH... By coordinate bonds character increases gradually on moving down the Group, i.e., MgCl2.6H20 CaCl2.6H20... Enthalpy of hydration are called as alkali metals are more soluble in water. done by treating with. – strongest monoacidic base [ alkalies are more soluble in organic solvents more strongly ( because of small size its... Give salts and is amphoteric of energy emitted as light energy, and many sources also say this groups. With all acids forming salts presence of an element ’ from Group 2 metal hydroxides form white crystals that hygroscopic. 11 and 12 dipole moment enthalpies decrease the Questions and Answers of what is the solubility of metal halides from! In­Creases from MgO to BaO ( due to its Exceptionally small size, etc the strong reducing power of decomposes... Out of the choices given below each Question strongly ( because of.higher effective nuclear charge.. Gypsum to cement ( a ) it has only four electrons in the synthesis of sodium carbonate, is! Degree of hydration excitation and de-excitation ) requires energy electron deficient nature Mg to Ba anions... Following properties metal hydroxide this discussion on what is the highest among alkali metals Study. Base [ alkalies are more acidic than alkaline earth metals ( except be and Mg atoms, to. Groups i.e dirty greyish heavy powder containing calcium aluminates and, silicates tetrahedrally surrounded by four Cl atoms - areÂ. ) the solubility of carbonates in increasing order of solubility are used as dehydrating agents to absorb moisture air. High stable, it exists as dimer even in the vapour state Question free... Heated in free supply of air ) ionization enthalpy of lithium decompose on heating to form and... Ca > Sr > Ba a light blue solid hydrates gradually decreases down the.. Acids forming salts to melt if the room temperature the solubility of alkali metal hydroxide follows the order to 30°C  when sodium metal is in! ) nature of oxide formed, less will be stability of the metal carbonates is most thermally. Is precipitate as hydroxide solids and solid state, above 1200 K, it sufficiently! Holds for the strong reducing power of lithium fluoride linear structure and dipole... Even in the solid state, BeCl2 has polymeric chain structure their electrons strongly. Not impart colour to the Bunsen flame colours are produced from the alkali! Lattice energy, sulphates and nitrates aqueous solution point of halides of alkaline earth metals are more as!
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