![](\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/chemistry\/ch10\/image056.png\")
(vapour) (ii) (solid).<\/p>\n16. Starting with sodium chloride how would you proceed to prepare (i) sodium metal (ii) sodium hydroxide (iii) sodium peroxide (iv) sodium carbonate?<\/p>\n
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 ?<\/p>\n
18. Describe two important uses of each of the following: (i) caustic soda (ii) sodium carbonate (iii) quicklime.<\/p>\n
19. Draw the structure of (i) (vapour) (ii) (solid).<\/p>\n
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.<\/p>\n
21. Describe the importance of the following: (i) limestone (ii) cement (iii) plaster of paris.<\/p>\n
Importance of plaster of Paris<\/p>\n
22. Why are lithium salts commonly hydrated and those of the other alkali metal ions usually anhydrous?<\/p>\n
23. Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone?<\/p>\n
24. Explain the significance of sodium, potassium, magnesium and calcium inbiological fluids.<\/p>\n
25. What happens when<\/p>\n
(i) sodium metal is dropped in water?<\/p>\n
(ii) sodium metal is heated in free supply of air?<\/p>\n
(iii) sodium peroxide dissolves in water?<\/p>\n
26. Comment on each of the following observations:<\/p>\n
(a) The mobilities of the alkali metal ions in aqueous solution are Li+< Na+< K+ < Rb+ < Cs+<\/p>\n
(b) Lithium is the only alkali metal to form a nitride directly.<\/p>\n
(c) ![](\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/chemistry\/ch10\/image067.png\")
for ![](\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/chemistry\/ch10\/image068.png\")
(where M = Ca, Sr or Ba) is nearly constant.<\/p>\n
27. State as to why<\/p>\n
(a) a solution of ![](\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/chemistry\/ch10\/image033.png\")
is alkaline?<\/p>\n
(b) alkali metals are prepared by electrolysis of their fused chlorides?<\/p>\n
(c) sodium is found to be more useful than potassium?<\/p>\n
28. Write balanced equations for reactions between<\/p>\n
(a) ![](\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/chemistry\/ch10\/image013.png\")
and water<\/p>\n
(b) ![](\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/chemistry\/ch10\/image075.png\")
and water<\/p>\n
(c) ![](\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/chemistry\/ch10\/image076.png\")
<\/p>\n
29. How would you explain the following observations?<\/p>\n
(i) BeO is almost insoluble but ![](\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/chemistry\/ch10\/image083.png\")
in soluble in water,<\/p>\n
(ii) BaO is soluble but ![](\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/chemistry\/ch10\/image084.png\")
is insoluble in water,<\/p>\n
(iii) LiI is more soluble than KI in ethanol.
\n30. Which of the alkali metal is having least melting point?<\/p>\n
(a) Na<\/p>\n
(b) K<\/p>\n
(c) Rb<\/p>\n
(d) Cs<\/p>\n
31. Which one of the following alkali metals gives hydrated salts?<\/p>\n
(a) Li<\/p>\n
(b) Na<\/p>\n
(c) K<\/p>\n
(d) Cs<\/p>\n
32. Which one of the alkaline earth metal carbonates is thermally the most stable?<\/p>\n
(a) ![](\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/chemistry\/ch10\/image092.png\")
<\/p>\n","protected":false},"excerpt":{"rendered":"