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The secondary precursors of photochemical smog are

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The secondary precursors of photochemical smog are
A. `SO_(2) and NO_(2)`
B. `NO_(2)` and hydrocarbons
C. `O_(3)` and PAN
D. `CO_(2) and O_(2)`
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Correct Answer - C
The primary precursors of photochemical smog are `NO_(2)` and hydrocarbons and the secondary precursors are ozone and PAN.
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