Question

Which of the following reactions is taking place resulting in discolouration of marble of the buildings like Taj Mahal?

• A. $CaCO_{3} + H_{2}SO_{4} \rightarrow CaSO_{4} + H_{2}O + Co_{2}$
• B. $CaCO_{3} + 2HCl \rightarrow CaCl_{2} + H_{2}O + CO_{2}$
• C. $CaCo_{3} + H_{2}O \rightarrow Ca(OH)_{2} + CO_{2}$
• D. $CaCO_{3} \rightarrow CaO + CO_{2}$

Answer 1

Answer: (A)

$CaCO_{3} + H_{2}SO_{4} \rightarrow CaSO_{4} + H_{2}O + Co_{2}$

Answer 2

: High level of sulphur and nitrogen Oxides cause acid rain which reacts with marble to decolourise it