Question

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	Peroxyacetyl nitrate	(i)	Global warming
(B)	Polychlorinated biphenyls	(ii)	Photochemical smog
(C)	Dioxides of carbon and sulphur	(iii)	Water pollutant
(D)	IR active molecules	(iv)	Acid rain

• A. (A) $\to$ (ii), (B) $\to$ (iii), (C) $\to$ (iv), (D) $\to$ (i)
• B. (A) $\to$ (iii), (B) $\to$ (iv), (C) $\to$ (ii), (D) $\to$ (i)
• C. (A) $\to$ (iv), (B) $\to$ (ii), (C) $\to$ (iii), (D) $\to$ (i)
• D. (A) $\to$ (i), (B) $\to$ (iii), (C) $\to$ (ii), (D) $\to$ (iv)

Answer 1

The correct option is A (A) $\to$ (ii), (B) $\to$ (iii), (C) $\to$ (iv), (D) $\to$ (i)

Peroxyacetyl nitrate is a secondary pollutant since they form in the atmosphere after the emission of primary pollutants. It is present in photochemical smog.

Surface water getting contaminated with PCB waste generally has high levels of PCBs in sediment, as the PCBs attach to organic matter. PCBs can be slowly released from the sediment into the water and evaporate into the air.

Sulfur dioxide another toxic chemical gas when combines with water and air, forms sulfuric acid, which is the main component of acid rain. Carbon dioxide in the air can dissolve in rainwater to form carbonic acid, $H_{2}C{O}_3$ and contributes to acid rain.

IR active molecules in the atmosphere can increase their vibrational energy by absorbing some of this infrared light, and thus increasing the temperature of the atmosphere resulting in Global warming.

The correct option is A.