Page 247 - Chemistry ICSE Class X
P. 247
Study of Compounds–Ammonia 233
14. (a) How will you distinguish between sodium chloride and ammonium chloride?
(b) Name the gas produced when ammonium sulphate is heated with sodium hydroxide solution. Write the
balanced chemical equation.
15. Explain the following: (a) high solubility of ammonia in water (b) dissolution of solid silver chloride in ammonia
16. Why is ammonium hydroxide used in qualitative analysis? Give two chemical equations to justify it.
17. Correct the following:
(a) A reddish brown precipitate is obtained when ammonium hydroxide is added to ferrous sulphate.
(b) Liquid ammonia is a solution of NH .
3
18. When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate
dissolves in excess ammonium hydroxide giving an inky blue solution. What is the cation (positive ion) present
in solution B? What is the probable colour of solution B?
19. The following reactions are carried out:
A: Nitrogen + Metal o Compound X
B: X + Water o Ammonia + Another compound
C: Ammonia + Metal oxide o Metal + Water + N 2
One metal that can be used for reaction A is magnesium.
(a) Write the formula of the compound X formed.
(b) Write the correctly balanced equation for reaction B where X is the compound formed.
(c) What property of ammonia is demonstrated by reaction C?
20. Tick (9) the correct answer.
(i) An ammonium salt which is not used for preparing ammonia gas is
(a) ammonium chloride (b) ammonium dichromate
(c) ammonium sulphate (d) none of these
(ii) Ammonia gas is dried by passing it through
(a) quicklime (b) phosphorus pentoxide
(c) conc. sulphuric acid (d) anhydrous calcium chloride
(iii) The favourable conditions for the production of ammonia by Haber’s process are:
(a) low temperature, high pressure (b) low temperature, high pressure, catalyst
(b) high temperature, low pressure (d) high temperature, high pressure, catalyst
(iv) Ammonia gas when burnt in an atmosphere of oxygen gives
(a) water, nitric oxide (b) water, nitrogen gas
(c) water, nitrous oxide (d) nitrogen gas
(v) Basic character of ammonia is due to the presence of
(a) one lone pair of electrons
(b) three bond pairs of electrons
(c) one lone pair of electrons and three bond pairs of electrons
(d) none of these
(vi) Which of the following reactions describes the reducing nature of ammonia?
(a) 2K + 2NH o 2KNH 2 + H
2
3
(b) 2NH 3 + 3I o NH .NI 3 + HI
3
2
(c) 3PbO + 2NH o N + 3H O + 3Pb
2
2
3
(d) 2NH 3 + H SO o (NH ) SO 4
2
4
4 2
Answers
(i) (b) (ii) (a) (iii) (b) (iv) (b) (v) (a) (vi) (c)
