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JEE Main levelSingle correct optionDifficulty 2 of 3ev022

In the atmosphere, nitrogen dioxide reacts with water according to $3 NO X_{2} + H X_{2} O 2 HNO X_{3} + X$ . The compound $X$ is

A $N X_{2}$
B $NO$
C $N X_{2} O$
D $NH X_{3}$

Answer: B

Balancing N and O: left has 3 N and 7 O;

2 HNO X_{3}

has 2 N and 6 O, so

X

has 1 N and 1 O, i.e.

NO

. N(+4) disproportionates to N(+5) and N(+2).

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