Which gases are evolved when Cu reacts with dil. nitric acid and when Zn reacts with conc. Nitric acid?

Nitric oxide and Nitrogen dioxide respectively

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Nitrous oxide and Nitrogen dioxide respectively

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Nitric oxide and Nitrous oxide respectively

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Nitrogen dioxide and Nitrous oxide respectively

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Solution

The correct option is A Nitric oxide and Nitrogen dioxide respectively
The reaction of nitric acid with different metals depends on the nature of the metal and the concentration of nitric acid used. Reaction of copper with dilute nitric acid liberates nitric oxide(NO) whereas the reaction of zinc with conc. nitric acid liberates nitrogen dioxide( $N O_{2}$ ).
$3 C u + 8 H N O_{3} (d i l u t e) \to 3 C u (N O_{3})_{2} + 4 H_{2} O + 2 N O (n i t r i c o x i d e)$
$Z n + 4 H N O_{3} (c o n c .) \to Z n (N O_{3})_{2} + 2 H_{2} O + 2 N O_{2} (n i t r o g e n d i o x i d e)$

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Similar questions

Gases evolved during the thermal decomposition of mercuric nitrate $H g (N O_{3})_{2}$ are:

N O

20.3 g

5.89 g

Oxides of nitrogen react with water to form acids. Hence, the statement "Nitrogen dioxide reacts with water to form nitric acid." is true.

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