Correct answer: (d) 1, 2 and 3
Explanation
- A
1 only
1 only. SO2/NOx and high Indian ash are also true.
- B
2 and 3 only
2 and 3 only. Trace metals in ash also hold.
- C
3 only
3 only. Under-counts.
- D
1, 2 and 3
All three. Fly ash carries As, Pb, Hg; stacks emit SO2 and NOx; Indian coal is high-ash.
Summary. Official key is (d) 1, 2 and 3. Coal ash holds toxic metals, coal plants emit sulphur and nitrogen oxides, and Indian thermal coal is high in ash compared with many traded coals.
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