34. Acid rain is caused due to pollution of atmosphere by :

(A) oxides of carbon and nitrogen
(B) oxides of nitrogen and sulphur
(C) oxides of nitrogen and phosphorous
(D) None of these

Ans. (B) oxides of nitrogen and sulphur

Acid rain is caused by emissions of sulfur dioxide and nitrogen oxides, which react with the water molecules in the atmosphere to produce acids.