Question

# Acid rain happens because:

A

Sun leads to heating of the upper layer of the atmosphere.

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B

The burning of fossil fuels releases oxides of carbon, nitrogen and sulphur into the atmosphere.

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C

Electrical charges are produced due to friction amongst clouds.

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D

Earth's atmosphere contains acids.

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Solution

## The correct option is B The burning of fossil fuels releases oxides of carbon, nitrogen and sulphur into the atmosphere.The explanation for the correct option:(B) - The burning of fossil fuels releases oxides of carbon, nitrogen and sulphur into the atmosphere.Acid Rain is defined as the precipitation of acid in the form of rain.When atmospheric pollutants like oxides of nitrogen and sulphur react with rainwater and come down with the rain, this results in Acid Rain.The causes of acid rain are sulphur and nitrogen particles which get mixed with the wet components of rain.The two strong acids present in acid rain are nitrogen oxide and sulphur dioxide.These two gases react with water in the atmosphere and oxygen in the air to form sulphuric acid and nitric acid.${\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{l}\right)+{\mathrm{SO}}_{2}\left(\mathrm{g}\right)\to {\mathrm{H}}_{2}{\mathrm{SO}}_{3}\left(\mathrm{aq}\right)$The explanation for the incorrect options.(A) - Sun leads to the heating of the upper layer of the atmosphere.Acid rain is caused by the precipitation of acids such as nitrogen and sulphur which is in the form of rain. So the sun has no role in acid rain.(C) - Electrical charges are produced due to friction amongst clouds.Clouds are responsible for the formation of rain, but it does not cause acid rains.Acid Rain is defined as the precipitation of acid in the form of rain.(D) - Earth's atmosphere contains acids.Many acids are formed in the atmosphere through oxidation and hydrolysis reactions. All the acids are not responsible for acid rains.The causes of acid rain are sulphur and nitrogen particles which get mixed with the wet components of rain.Therefore, the correct option is (B),i.e., burning fossil fuels releases oxides of carbon, nitrogen and sulphur in the atmosphere.

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