Question

State an balacned eqation for:
A) Mn + HNO3 --> ??
B) Mg + HNO3 --> ??​

Answer 1

3Mn + 8HNO3 → 3Mn(NO3)2 + 2NO + 4H2O

4Mg + 10HNO3 → 4Mg(NO3)2 + N2O + 5H2O

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Answer 2

When a metal reacts with nitric acid, hydrogen gas $({H}_{2})$ is not evolved because Nitric acid $(H{NO}_{3})$ is a strong oxidizing agent.

In case of Magnesium (Mg) and Manganese (Mn), they react with very dilute Nitric acid $(H{NO}_{3})$ to evolve Hydrogen $({H}_{2})$ gas.

Equations:

A)

$Mn(s) + 2H{NO}_{3}(aq) \longrightarrow Mn{({NO}_{3})}_{2}(aq) + {H}_{2}(g)$

B)

$Mg (s) + 2H{NO}_{3}(aq) \longrightarrow Mg{({NO}_{3})}_{2} (aq) + {H}_{2} (g)$