On the basis of data given below, $\mathrm{E}_{\mathrm{Sc}^{3+} / \mathrm{Sc}^{2+}}^{\ominus}=-0.37,…

On the basis of data given below, $\mathrm{E}_{\mathrm{Sc}^{3+} / \mathrm{Sc}^{2+}}^{\ominus}=-0.37, \mathrm{E}_{\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}}^{\ominus}+1.57$
$\mathrm{E}_{\mathrm{Cr}^{2+} / \mathrm{Cr}}^{\ominus}=-0.90, \mathrm{E}_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\Theta}=0.34$
Which of the following statements is incorrect?
  1. $\mathrm{Sc}^{3+}$ has good stability due of $[\mathrm{Ar}] 3 d^{0} 4 s^{0}$ configuration.
  2. $\mathrm{Mn}^{3+}$ is more stable than $\mathrm{Mn}^{2+}$.
  3. $\mathrm{Cr}^{2+}$ is reducing in nature.
  4. Copper does not give $\mathrm{H}_{2}$ on reaction with dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$.

Solution

$\mathrm{Mn}^{2+}\left(d^{5}ight)$ is more stable than $\mathrm{Mn}^{3+}\left(d^{4}ight)$, thus $\mathrm{E}_{\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}}=+\mathrm{ve}$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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