Environmental Chemistry - Result Question 36
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.
$$ CaCO _3(s) \underset{\text { (Acid rain) }}{2 H^{\oplus}(a q)} Ca^{2+}(a q)+H _2 O(l)+CO _2(g) \uparrow $$
BETA
