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Nitric acid reacts with most of the meta...

Nitric acid reacts with most of the metals (except noble metals like gold and platinum) and non-metals. Towards its reaction with metals, `HNO_3` acts as an acid as well as an oxidising agent. Like other acids, `HNO_3` liberate nascent hydrogen from metals which further reduces the nitric acid into number of products like NO, `NO_(2)`, `N_(2)O` or `NH_(3)`. The different stages of reduction of nitric acid are:

The product of the reduction of `HNO_3` depends upon the nature of the metal, concentration of nitric acid and temperature.
Which of the following reactions is used to prepare laughing gas?

A

`Pb+dil.HNO_(3)rarr`

B

`Hg+dil.HNO_(3)rarr`

C

`Cu+dil.HNO_(3)rarr`

D

`Zn+dil.HNO_(3)rarr`

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