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Home » A non-metal A which is the largest constituent of air, when heated with H2 in 1:3 ratio in the presence of a catalyst (Fe) gives a gas B. On heating with O2 it gives an oxide C. If this oxide is passed into water in the presence of air, it gives an acid D which acts as a strong oxidising agent.
A non-metal A which is the largest constituent of air, when heated with H2 in 1:3 ratio in the presence of a catalyst (Fe) gives a gas B. On heating with O2 it gives an oxide C. If this oxide is passed into water in the presence of air, it gives an acid D which acts as a strong oxidising agent.
CBSE | Chemistry | Class 10 | Exercise 1 | Metals and Non Metals | NCERT | Science
A non-metal A which is the largest constituent of air, when heated with H2 in 1:3 ratio in the presence of a catalyst (Fe) gives a gas B. On heating with O2 it gives an oxide C. If this oxide is passed into water in the presence of air, it gives an acid D which acts as a strong oxidising agent.

(a) Identify A, B, C and D

(b) To which group of periodic table does this non-metal belong?

Answers:

(a)

A – Nitrogen 

Explanation: Nitrogen is the non-metal which is the largest constituent of air.

B – Ammonia

Explanation: When Nitrogen is heated with H2 in 1:3 ratio in the presence of a catalyst (Fe) gives ammonia gas.

Reaction Involved: 3N2+3H2 →2NH3

 C – Nitrogen-di-oxide

Explanation: On heating with oxygen, Nitrogen gives Nitrogen-di-oxide.

Reaction Involved: N2 +3O →2NO2

D – Nitric acid

Explanation: If Nitrogen-di-oxide is passed into water in the presence of air, it gives Nitric acid which acts as a strong oxidising agent.

Reaction Involved: NO2 + H2O →HNO3

(b) This non-metal belongs to Group 15 of the periodic table.

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