TS EAMCET · Chemistry · Environmental Chemistry

Acid rain is mainly caused by the emissions of which of the following gases? I. Sulphur dioxide II. Carbon dioxide III. Nitrogen dioxide IV. Methane

A I and II
B I, II and III
C I and III
D I, II, III and IV

Verified Solution

Answer & Solution

Correct Answer

(C) I and III

Step-by-step Solution

Detailed explanation

Out of the gases, I. \(\mathrm{SO}_2\), II. \(\mathrm{CO}_2\), III. \(\mathrm{NO}_2\) and IV. \(\mathrm{CH}_4\) Only \(\mathrm{SO}_2\) and \(\mathrm{NO}_2\) are mainly responsible for acid rain.…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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List-1 Acid		List-2 Ka(ionization constant)
A)	$HCN$	I)	$6.8 \times 10^{- 4}$
B)	$H_{2} C_{2} O_{4}$	II)	$8.9 \times 10^{- 8}$
C)	$H_{2} S$	III)	$4.9 \times 10^{- 10}$
D)	Niacin	IV)	$5.6 \times 10^{- 2}$
		V)	$1.5 \times 10^{- 5}$