Name the gas produced when ammonium sulphate is heated with sodium hydroxide solution.

1. Hydrogen chloride gas
2. Ammonia
3. Sulphuric acid
4. Chlorine

In which of the following beaker (I, II, III and IV) will coating on Zn be done?

1. I and III
2. II only
3. III and IV
4. IV only

The volume occupied by 1 mole of gas at STP is ……………

1. 2.42 L
2. 2.24 L
3. 2.44 L
4. 22.4 L

An amphoteric hydroxide having gelatinous white precipitate is ……………

1. zinc hydroxide
2. sodium hydroxide
3. copper (II) hydroxide
4. None of the above