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  4. When zinc is reacted with dilute and concentrated nitric acid, respectively, gives rise to:

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Q. When zinc is reacted with dilute and concentrated nitric acid, respectively, gives rise to:

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Solution:

$Zn$ on reaction with $HNO_{3}$
Zinc reacts with the dilute nitric acid to form the nitrous oxide gas. It is also known as the laughing gas.
$4Zn+10HNO_{3}\left(dil\right) \rightarrow 4Zn\left(N O_{3}\right)_{2}+N_{2}O+5H_{2}O \, $
Zinc reacts with the concentrated nitric acid to form the brown colour nitrogen dioxide gas.
$Zn+4HNO_{3}\left(conc .\right) \rightarrow Zn\left(N O_{3}\right)_{2}+2NO_{2}+2H_{2}O$