Discussion
Match the List-I and List-II and select the correct answer from the codes given below :
| List-I | List-II |
|---|---|
| (a) Acid rain | (1) CHCl2 CHF2 |
| (b) Photochemical smog | (2) CO |
| (c) Combination with hemoglobin | (3) CO2 |
| (d) Depletion of ozone | (4) Unsaturated hydrocarbons |
Answer: B
The correct matching is a-3, b-4, c-2, d-1.
- Acid rain: among the listed gases, CO2 dissolves in rain to form carbonic acid; the stronger acids come mainly from sulphur and nitrogen oxides.
- Photochemical smog forms when sunlight acts on nitrogen oxides and unsaturated hydrocarbons, producing ozone and PAN.
- Carbon monoxide combines with haemoglobin to form carboxyhaemoglobin and blocks oxygen transport.
- Ozone depletion is caused by chlorine from halogenated compounds such as the listed CHCl2CHF2.
Options A, C and D all link CO with acid rain, so only option B fits.
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