Which gas is released when iron reacts with conc nitric acid?

Nitrous oxide

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Nitric oxide

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Nitrogen dioxide

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None of the above

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Solution

The correct option is C Nitrogen dioxide
Nitrogen dioxide gas is formed when iron reacts with conc nitric acid.

$F e + 6 H N O_{3} \to F e (N O_{3})_{3} + 3 H_{2} O + 3 N O_{2}$

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