Question

Nitrogen gas is prepared :

• A. by heating ammonium nitrate.
• B. by reacting chlorine with liquor ammonia.
• C. by passing $HN{O}_3$ vapours on red hot copper
• D. by beating lead nitrate.

Answer 1

The correct option is A by heating ammonium nitrate.

to prepare pure nitrogen in laboratory a mixture of ammonium chloride and sodium nitrite is heated. The product formed is ammonium nitrite. This compound is very unstable and breaks into nitrogen and water.