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Hess' Law

Conc. HNO3 ...

Question

Conc. $H N O_{3}$ is yellow coloured liquid due to :

dissolution of NO in conc.

H N O_{3}

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dissolution of

N O_{2}

in conc.

H N O_{3}

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dissolution of

N_{2} O

in conc.

H N O_{3}

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dissolution of

N_{2} O_{3}

in conc.

H N O_{3}

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Solution

The correct option is B dissolution of $N O_{2}$ in conc. $H N O_{3}$
Concentrated $H N O_{3}$ usually acquires yellow colour due to its decomposition by sunlight into $N O_{2}$ .
$4 H N O_{3} \to 4 N O_{2} + 2 H_{2} O + O_{2}$

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