Class 10 ICSE CHEMISTRY questions onAMMONIA - 2

State your observations when:

1.      The gas produced when Mg₃N₂ is treated with warm water is passed into Nesseler’s reagent.

2.      Fountain experiment using Ammonia gas.

3.      Oxidation of Ammonia in the absence of catalyst.

4.      Catalytic oxidation of Ammonia gas.

5.      Cu²⁺/Fe³⁺/Fe²⁺/Zn²⁺ /Pb²⁺ salts are treated with Ammonium hydroxide in small amounts then in excess amount.

6.      Ammonia gas reacts with excess Chlorine gas.

7.      Excess Ammonia with Chlorine gas.

8.      CuO is heated with Ammonia gas.

9.      PbO is heated with Ammonia gas.

10.  Warm water is added to the product obtained when Magnesium is burnt in Nitrogen gas.

11.  Calcium hydroxide is heated with Ammonium chloride.

12.  A glass rod is exposed to the gas liberated when an Ammonium salt is heated with an alkali.

Give reasons:

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

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

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

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

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

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

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

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

9.      Ammonia gas is not collected over water.

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

11.  Liquid Ammonia is used as a refrigerant.

12.  Ammonium hydroxide is weak base.