Concentrated $H N O_{3},$ upon long standing, turns yellow-brown due to the formation of
(IIT-JEE, 2012)

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N O_{2}

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N_{2} O

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N_{2} O_{4}

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Solution

The correct option is B $N O_{2}$
$4 H N O_{3} \to 2 H_{2} O + 4 N O_{2} + O_{2}$
$N O_{2}$ remains dissolved in $H N O_{3}$ colouring it yellow or even red at higher temperature.

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Similar questions

H N O_{3},

H N O_{3},

Statement: Concentrated nitric acid, upon long-standing, turns yellow-brown due to the formation of $N O_{2}$ .

State whether the given statement is true or false.

H N O_{3}

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