Q. Zn gives hydrogen with $H_{2}SO_{4}$ and HCl but not with $HNO_{3}$ because

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A

Zn acts as oxidising agent when reacts with $HNO_{3}$

B

$HNO_{3}$ is weaker acid than $H_{2}SO_{4}$ and HCl

C

Zn is above the hydrogen in electrochemical series

D

$NO_{3}^{-}$ is reduced in preference to $H^{+}$ ion

Solution:

Hydrogen gas is not released when metal reacts with $HNO_{3}$ . This is because $HNO_{3}$ is a strong oxidising agent and it immediately oxidises the $H^{+}$ ion in hydrogen to form water, while its $NO_{3}^{-}$ ion gets reduced.
$Zn+4HNO_{3} \rightarrow Zn\left(\right.NO_{3}\left(\left.\right)_{2}+2NO_{2}+2H_{2}O$

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5. The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is
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