Class 11 Chemistry NCERT Solutions For Chapter 10 the S Block Elements

Chapter 10 The S -Block Elements

Download NCERT Solutions for Class 11 Chemistry

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NCERT Solutions Exercises Questions

Question 10.1 What are the common physical and chemical features of alkali metals ?

Question 10.2 Discuss the general characteristics and gradation in properties of alkaline earth metals.

Question 10.3 Why are alkali metals not found in nature ?

Question 10.4 Find out the oxidation state of sodium in Na2O2. 5.5 Explain why is sodium less reactive than potassium.

Question 10.6 Compare the alkali metals and alkaline earth metals with respect to (i) ionisation enthalpy (ii) basicity of oxides and (iii) solubility of hydroxides.

Question 10.7 In what ways lithium shows similarities to magnesium in its chemical behaviour?

Question 10.8 Explain why can alkali and alkaline earth metals not be obtained by chemical reduction methods?

Question 10.9 Why are potassium and caesium, rather than lithium used in photoelectric cells?

Question 10.10 When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.

Question 10.11 Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why ?

Question 10.12 Discuss the various reactions that occur in the Solvay process.

Question 10.13 Potassium carbonate cannot be prepared by Solvay process. Why ?

Question 10.14 Why is Li2CO3 decomposed at a lower temperature whereas Na2CO3 at higher temperature?

Question 10.15 Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals.
(a) Nitrates
(b) Carbonates
(c) Sulphates.

Question 10.16 Starting with sodium chloride how would you proceed to prepare
(i) sodium metal
(ii) sodium hydroxide
(iii) sodium peroxide
(iv) sodium carbonate ?

Question 10.17 What happens when
(i) magnesium is burnt in air
(ii) quick lime is heated with silica
(iii) chlorine reacts with slaked lime
(iv) calcium nitrate is heated ?

Question 10.18 Describe two important uses of each of the following :
(i) caustic soda
(ii) sodium carbonate
(iii) quicklime.

Question 10.19 Draw the structure of
(i) BeCl2 (vapour)
(ii) BeCl2 (solid).

Question 10.20 The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain.

Question 10.21 Describe the importance of the following :
(i) limestone
(ii) cement
(iii) plaster of paris.

Question 10.22 Why are lithium salts commonly hydrated and those of the other alkali ions usually anhydrous?

Question 10.23 Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone ?

Question 10.24 Explain the significance of sodium, potassium, magnesium and calcium in biological fluids.

Question 10.25 What happens when
(i) sodium metal is dropped in water ?
(ii) sodium metal is heated in free supply of air ?
(iii) sodium peroxide dissolves in water ?

Question 10.26 Comment on each of the following observations:
(a) The mobilities of the alkali metal ions in aqueous solution are Li+ < Na+ < K+ < Rb+ < Cs+
(b) Lithium is the only alkali metal to form a nitride directly.
(c) E0 for M2+ (aq) + 2e– → M(s) (where M = Ca, Sr or Ba) is nearly constant.

Question 10.27 State as to why
(a) a solution of Na2CO3 is alkaline ?
(b) alkali metals are prepared by electrolysis of their fused chlorides ?
(c) sodium is found to be more useful than potassium ?

Question 10.28 Write balanced equations for reactions between
(a) Na2O2 and water
(b) KO2 and water
(c) Na2O and CO2.

Question 10.29 How would you explain the following observations?
(i) BeO is almost insoluble but BeSO4 in soluble in water,
(ii) BaO is soluble but BaSO4 is insoluble in water,
(iii) LiI is more soluble than KI in ethanol.

Question 10.30 Which of the alkali metal is having least melting point ?
(a) Na
(b) K
(c) Rb
(d) Cs

Question 10.31 Which one of the following alkali metals gives hydrated salts ?
(a) Li
(b) Na
(c) K
(d) Cs

Question 10.32 Which one of the alkaline earth metal carbonates is thermally the most stable ?
(a) MgCO3
(b) CaCO3
(c) SrCO3
(d) BaCO3

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