Which of the following gas is released when copper reacts with dil. nitric acid?

NO₂

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N₂O₅

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N₂

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Solution

The correct option is B
NO

Copper reacts with dil. $H N O_{3}$ and liberates nitric oxide gas.

$3 C u + 8 H N O_{3} (d i l) \to 3 C u (N O_{3})_{2} + 2 N O ↑ + 4 H_{2} O$

Copper reacts with conc. $H N O_{3}$ and conc. $H_{2} S O_{4}$ and liberates nitrogen dioxide and sulphur dioxide respectively.

$C u + 4 H N O_{3} (c o n c .) \to C u (N O_{3})_{2} + 2 N O_{2} ↑ + 2 H_{2} O$

$C u + 2 H_{2} S O_{4} (c o n c .) \to C u S O_{4} + S O_{2} ↑ + 2 H_{2} O$

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