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Question

X is a substance which is present usually in air in its gaseous state.
X combines with non-metallic oxides in air to form inorganic acids and pours down as acid rain. 
Find X.
  1. Nitrogen
  2. Oxygen
  3. Sulphur
  4. Water 


Solution

The correct option is D Water 
Pollutants like nitrogen dioxide and sulphur dioxide reacts with water vapour present in air to form nitric acid and sulphuric acid respectively. These acids pour down along with rain, making it acidic. Hence, it is called as acid rain. 

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