Nitrogen gas can be obtained by heating

1. Ammonium nitrate
2. Ammonium nitrite
3. Magnesium nitride
4. Ammonium chloride

Ammonia can be obtained by adding water to:

1. NH₄Cl
2. Mg₃N₂
3. Mg (NO₃) ₂
4. (NH₄)₂ SO₄

In the Haber's process, the ratio of reactants nitrogen and hydrogen is:

1. 2 : 3
2. 3 : 2
3. 1 : 3
4. 3 : 1

When ammonia reacts with an excess of chlorine, the main product formed is:

1. NH₄Cl
2. NCl₃
3. Cl₂
4. HCl