ICSE CHEMISTRY CLASS 10 - Answers - Give reasons - AMMONIA

ICSE CHEMISTRY CLASS 10 Give Reasons : Ammonia

1.     In the laboratory preparation of Ammonia, Calcium hydroxide is taken in excess quantity.

Ans: To prevent sublimation of Ammonium chloride.

2.     Ammonium nitrate is not used in the preparation of Ammonia gas.

Ans: Ammonium nitrate on heating decomposition to give Nitrous oxide.

          (or) Ammonium nitrate is explosive.

3.     Conc. H₂SO₄ is not used as a drying agent for Ammonia gas.

Ans: Conc. H₂SO₄ reacts with ammonia to give Ammonium sulphate.

4.     Round bottom flask is kept in inclined position in the preparation of Ammonia in laboratory preparation of Ammonia.

Ans: To avoid water from trickling down the round bottom flask which may cause cracks.

5.     NaOH is not preferred in the laboratory preparation of Ammonia gas.

Ans: Sodium hydroxide is a deliquescent substance.

6.     Metal nitrides are not preferred to prepare Ammonia gas.

Ans: Metal nitrides are expensive.

7.     In Haber’s process the reaction mixture is heated initially only.

Ans: It is an exothermic reaction.

8.     Lead hydroxide is insoluble in excess Ammonium hydroxide but Copper hydroxide is soluble.

Ans: Copper hydroxide with excess Ammonium hydroxide forms a water soluble complex compound but Lead hydroxide does not.

9.     Ammonia gas is not collected over water.

Ans: Ammonia is highly soluble in water.

10. Platinum continues to glow even after the heating is discontinued in catalytic oxidation of Ammonia gas.

Ans: The reaction is an exothermic reaction.

11. Liquid Ammonia is used as a refrigerant.

Ans: Liquid Ammonia evaporates by absorbing the heat quickly.

12. Ammonium hydroxide is weak base.

Ans: Ammonium  hydroxide solution contains a less concentration of Hydroxide ions.

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