Environmental Chemistry - Result Question 14
####14. Taj Mahal is being slowly disfigured and discoloured. This is primarily due to
(a) water pollution
(c) global warming
(b) soil pollution
(d) acid rain
(2019 Main, 11 Jan II)
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Answer:
Correct Answer: 14. (a)
Solution:
- Acid rain $\left(pH=3.5\right.$ - 5.6) constitutes strong acids like $HNO _3$, $H _2 SO _4$ and $H _2 SO _3$ which slowly react with marble $\left(CaCO _3\right)$ of Taj Mahal and make it disfigured and discoloured. Here, $CaCO _3$ (marble) gets dissolved in acids.
$$ CaCO _3(s) \underset{\text { (Acid rain) }}{2 H^{\oplus}(a q)} Ca^{2+}(a q)+H _2 O(l)+CO _2(g) \uparrow $$
