Question

Which group of periodic table does this non-metal A belongs to?

• A. Group 13
• B. Group 14
• C. Group 15
• D. Group 16

Answer 1

Answer: (C)

Group 15

The non-metal A belongs to group 15 of the periodic table. The non-metal A is nitrogen. In the air, about 78 mole % is nitrogen.

When nitrogen is heated with hydrogen in 1:3 ratio in the presence of a catalyst (Fe), it gives a gas B which is ammonia.

$N_2+3H_2\to 2N{H}_3$

On heating with oxygen, nitrogen gives an oxide C which is nitric oxide.

$N_2+O_2\to 2NO$

If nitric oxide is passed into the water in the presence of air it gives an acid D which is nitric acid. Nitric acid acts as a strong oxidising agent.

$4NO+3O_2+2H_{2}O\to 4HN{O}_3$

Hence, the correct option is $\text{C}$