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NEET levelSingle correct optionDifficulty 1 of 3qa169

Sodium nitrite is warmed with dilute $H X_{2} SO X_{4}$ . A colourless gas is evolved that turns reddish brown on coming in contact with air. The colourless gas is

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

Answer: B

Nitrous acid formed from nitrite decomposes as

3 HNO X_{2} HNO X_{3} + 2 NO + H X_{2} O

. Colourless

NO

is oxidised by air to brown

NO X_{2}

.

N X_{2} O

and

N X_{2}

do not react with air and

NH X_{3}

is not formed.

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