Question

Give reactions of calcium and magnesium with dilute Nitric acid

Answer 1

$Ca+HNO _{3} =No reaction$
$Mg+2HNO _{3}=Mg(NO _{3} ) _{2} +H_{2}$
Dilute nitric acid only reacts with Magnesium and Manganese metals.

Answer 2

Metals are very reactive when they react with dilute acid to release hydrogen gas. They also form metallic compounds with dilute acid.

When magnesium react with dilute nitric acid it forms magnesium nitrate with hydrogen gas.  

$\mathrm{Mg} (\mathrm{s}) + 2 \mathrm{HNO}_{3} (\mathrm{aq}) \rightarrow \mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2} (\mathrm{aq}) + \mathrm{H}_{2}(\mathrm{g})$

When calcium react with dilute nitric acid it forms calcium nitrate with hydrogen gas.  

$\mathrm{Ca} (\mathrm{s}) + 2 \mathrm{HNO}_{3} (\mathrm{aq}) \rightarrow \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq}) + \mathrm{H}_{2} (\mathrm{g})$