State your observation when conc. nitric acid is heated in absence of copper gives :

yellow gas

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brown gas

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grey gas

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black gas

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Solution

The correct option is B brown gas
When conc. nitric acid is heated, it decomposes to give brown coloured pungent-smelling gas nitrogen dioxide.

$4 H N O_{3} (c o n c .) h e a t - - \to 2 H_{2} O (g) + 4 N O_{2} (g) + O_{2} (g)$

Option B is correct.

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Similar questions

Products obtained when Conc. $H N O_{3}$ (Nitric acid ) is heated.

K N O_{3}

N a N O_{3}

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