Question

Acid rains are produced by :

• A. Excess NO2 and SO2 from burning fossil fuels
• B. Excess production of NH3 by industry and coal gas
• C. Excess release of carbon monoxide by incomplete combustion
• D. Excess formation of CO2 by combustion and animal respiration.

Answer 1

Answer: (A)

Excess NO2 and SO2 from burning fossil fuels

Answer 2

When fossil fuel burnt in automobile engines different oxides like NO, NO2, SO2, SO3 are produced. In the presence of moisture these oxides convert in the acids. THese acids comes down from the atmosphere in the form of rain, called acid rain.

S (from fossil fuel) + O2 $\longrightarrow$SO2

SO2 + O3 $\longrightarrow$SO3 + O2

SO2 + H2O2 $\longrightarrow$H2SO4

SO3 + H2O $\longrightarrow$H2SO4

2NO2 + H2O $\longrightarrow$HNO3 + HNO2