Question

Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?

• A. $M{n}^{2+}$
• B. $T{i}^{2+}$
• C. $V^{2+}$
• D. $C{r}^{2+}$

Answer 1

Answer: (A)

$M{n}^{2+}$

The reactivity of transition metals decreases from $T{i}^{+2}$ to $V^{+2}$ to $C{r}^{+2}$ and finally $M{n}^{+2}$. Therefore, the reactivity of $M{n}^{2+}$ is very less. Therefore, $M{n}^{+2}$ does not liberate hydrogen gas on reaction with dilute acids.

Answer: (A) $M{n}^{2+}$