Question

High emission of which of the following pollutant can cause acid rains?

• A. Sulphur dioxide
• B. Carbon dioxide
• C. Oxygen
• D. None of the above.

Answer 1

The correct option is A Sulphur dioxide

Two elements, sulphur and nitrogen, are primarily responsible for the harmful effects of acid rain. Sulfur is found as a trace element in coal and oil. When these are burned in power plants and industrial boilers, the sulphur combines with oxygen to form sulphur dioxide (SO${}_2$). Because SO${}_2$ does not react with most chemicals found in the atmosphere, it can travel long distances. Eventually, if it comes in contact with ozone or hydrogen peroxide, it can be converted to sulphur trioxide. Sulphur trioxide can dissolve in water, forming a dilute solution of sulfuric acid.

So, the correct answer is option A.