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JEE Main levelSingle correct optionDifficulty 2 of 3ev027

Marble (calcium carbonate) is attacked by sulphuric acid present in acid rain. The products are

A $CaSO X_{3}$ , $H X_{2} O$ and $CO X_{2}$
B $CaO$ , $SO X_{3}$ and $H X_{2} O$
C $Ca (OH) X_{2}$ and $SO X_{2}$
D $CaSO X_{4}$ , $H X_{2} O$ and $CO X_{2}$

Answer: D

The reaction is

CaCO X_{3} + H X_{2} SO X_{4} CaSO X_{4} + H X_{2} O + CO X_{2}

. This is the principal chemical reason for the damage to marble monuments such as the Taj Mahal; the sulphate is more soluble and flakes away.

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