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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ev049

Which of the following steps and statements about the photochemical smog chain are correct?

A $O X_{3} + NO NO X_{2} + O X_{2}$
B $O + O X_{2} O X_{3}$
C $NO X_{2} h ν NO + O$
DAtomic oxygen reacts directly with hydrocarbons to give ozone.

Answer: A, B, C

The first three are the standard steps: photolysis of

NO X_{2}

, formation of ozone from O atoms and

O X_{2}

, and oxidation of

NO

by ozone. Ozone is not produced by O atoms attacking hydrocarbons; the O atom combines with

O X_{2}

. Hence the last statement is false.

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