On reaction of magnesium nitride with water, the gas which is liberated is ……………

1. NH₃
2. HCl
3. H₂
4. N₂

In an exothermic process, energy is released in the form of heat or light.

Which of the following could be exothermic processes?

P. Sublimation of camphor crystals

Q. Reaction of water with quick lime

R. Dilution of an acid

1. Only P
2. Only Q
3. Only R
4. Both Q and R

The pH values of four solutions A, B, C and D are given in the table.

Which solution will liberate CO₂ when reacted with sodium carbonate?

1. A
2. B
3. C
4. D

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

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