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B
Sulphur dioxide
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C
Hydrogen
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D
Oxygen
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Solution
The correct option is A Sulphur dioxide The reaction of sulphur dioxide with water molecules present in atmosphere forms sulphuric acid which gets precipitated through acid rain, This precipitation can cause decolouring, cracks and decomposition of the monument. The location of Mathura Refinery near to the Taj Mahal is a major reason for the accumulation of the sulphur dioxide in the rain. Hydrogen and oxygen are the natural components of water. Chlorine does not contribute to the acid rain.