Which of the following gases are released upon treating zinc with diluted and then concentrated nitric acid?

Nitrogen dioxide and nitrous oxide

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Nitric oxide and nitrous oxide

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Nitrous oxide and nitrogen dioxide

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Nitrous oxide and nitric oxide

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Solution

The correct option is C Nitrous oxide and nitrogen dioxide
The products released depend on the concentration of nitric acid. In case of zinc metal, diluted nitric acid treatment release nitrous oxide and concentrated nitric acid causes the release of nitrogen dioxide.
$4 Z n + 10 H N O_{3} (d i l .) \to 4 Z n (N O_{3})_{2} + N_{2} O + 5 H_{2} O Z n + 4 H N O_{3} (c o n c .) \to Z n (N O_{3})_{2} + 2 N O_{2} + 2 H_{2} O$

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