Question

A non-metal A which is the largest constituent of air combines with hydrogen on heating in the presence of Fe (as catalyst) and forms a gas 

B. When this gas B is treated with H₂SO₄, compound C is formed which is broadly used as chemical fertiliser. 

(i) Identify A, B and C. 

(ii) Locate the position of A in the modern periodic table. 

(iii) Which elements are present before and after the element A? 

(iv) Write the electronic configuration of element A.

Answer 1

(i) The largest non-metal constituent of air is nitrogen (N) and it is present as N₂ gas .It reacts with hydrogen in presence of Fe catalyst to give Ammonia (NH₃). Ammonia reacts with conc. H₂SO₄ to give ammonium sulphate (NH₄)₂SO₄. 

Thus A= Nitrogen (N) 

B=Ammonia (NH₃) 

C= Ammonium sulphate (NH₄)₂SO₄ 

(ii) Element A is Nitrogen. It lies in the 2^nd period and 15^th group of the modern periodic table. 

(iii) Carbon comes before nitrogen and oxygen comes after nitrogen in the 2^nd period. 

(iv) The atomic number of nitrogen is 7. So, its electronic configuration is 2,5.