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JEE Main levelSingle correct optionDifficulty 2 of 3ev021

Which of the following oxides is NOT a direct contributor to the formation of acid rain?

A $N X_{2} O X_{5}$
B $NO X_{2}$
C $CO$
D $SO X_{3}$

Answer: C

CO

is a neutral oxide and does not form an acid with water.

SO X_{3}

gives

H X_{2} SO X_{4}

,

NO X_{2}

gives

HNO X_{3}

(with

HNO X_{2}

or

NO

), and

N X_{2} O X_{5}

gives

HNO X_{3}

.

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