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Reation with Metals

Which gas is ...

Question

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

A

Nitrous oxide

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B

Nitric oxide

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C

Nitrogen dioxide

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D

None of the above

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Solution

The correct option is C
Nitrogen dioxide

Nitric oxide gas is formed when iron reacts with conc nitric acid.

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

Nitric oxide is formed when Fe reacts with dilute nitric acid

$3 F e + 8 H N O_{3} \to 3 F e (N O_{3})_{2} + 4 H_{2} O + 2 N O$

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Q. "Nitric oxide reacts with oxygen to form reddish brown nitrogen dioxide gas". Choose the correct equation for the above reaction

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