Excess presence of ....... and ....... gases may cause acid rain.

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Solution

Acid rain refers to precipitation with a pH of less than 5. It is, in fact, a mixture of H $_{2}$ SO $_{4}$ and HNO $_{3}$ ; the ration of two acids vary depending on the relative quantities of sulphur oxides(SO $_{2}$ ) and nitrogen oxides(NO $_{2}$ ) present in the atmosphere. These oxides are mainly produced by combustion of fossil fuels, smelters, industries, power plants, automobile exhausts, domestic fires etc. On an average, H $_{2}$ SO $_{4}$ contribute 60-70% of the acidity while HNO $_{3}$ contributes 30-40%.
So, the correct answer is 'NO $_{2}$ ,SO $_{2}$ '.

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