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a
use of catalytic converters in automobiles
b
setting the air-fuel ratio in engine in such a way to produce some CO and unburnt hydrocarbons
c
Both (1) and (2)
d
None the above
answer is C.
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Detailed Solution
Smog is due to unburnt hydrocarbons which are oxidized to RCHO and RCOR which in tum combines with NO, forming PAN (peroxyacetylnitrate, RCO3NO2). If catalytic converters are used in automobiles, and ratio of air and fuel is in a ratio to release CO and unburnt hydrocarbons in small amount, then smog formation is controlled.