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Question

Which salts are responsible for yellow colour of Taj Mahal in Agra due to acid rain?


A
CaCl2 and CaSO4
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B
Ca(NO3)2 and CaSO4
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C
Ca(NO3)2 and BaSO4
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D
CaSO4 and BaCl2
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Solution

The correct option is B $$Ca(NO_{3})_{2}$$ and $$CaSO_{4}$$
Calcium nitrate $$(Ca(NO_{3})_{2})$$ and calcium sulphate $$(CaSO_{4})$$ are responsible for yellow colour of Taj Mahal in Agra due to acid rain.
The reaction that take place with limestone (marble) are
$$CaCO_{3} + H_{2}SO_{4}\rightarrow CaSO_{4} + CO_{2} + H_{2}O$$
$$CaCO_{3} + 2HNO_{3} \rightarrow Ca(NO_{3})_{2} + CO_{2} + H_{2}O$$.

Chemistry

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