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?

AcademicChemistryNCERTClass 10

(a) Non-metal “A” is nitrogen because it is the largest constituent of air which constitute around 78% of the gases. 

When heated with H2 in 1:3 ratio in the presence of a catalyst (Fe) following reaction takes place.
$3N_2+3H_2 →2NH_3$
Therefore, B is Ammonia.

On heating Nitrogen with O2, it gives nitrogen-di-oxide
$N_2 +2O_2→2NO_2$
Therefore, C is Nitrogen dioxide.

When nitrogen-dioxide is passed into the water in the presence of air, it gives Nitric acid
$NO_2 + H_2O →HNO_3$
Therefore, D is Nitric acid.

(b) Element A (Nitrogen) belongs to group 15 of the periodic table.
raja
Updated on 10-Oct-2022 13:27:27

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