The correct statement(s) about C r 2 + and M n 3 + is (are) [Atomic number of Cr = 24 and Mn = 25]

1. $\mathrm{C}{\mathrm{r}}^{2+}$ is a reducing agent
2. $\mathrm{M}{\mathrm{n}}^{3+}$ is an oxidizing agent
3. Both $\mathrm{C}{\mathrm{r}}^{2+}$ and $\mathrm{M}{\mathrm{n}}^{3+}$ exhibit ${\mathrm{d}}^4$ electronic configuration
4. When $\mathrm{C}{\mathrm{r}}^{2+}$ is used as a reducing agent, the chromium ion attains ${\mathrm{d}}^5$ electronic configuration.

Solution

Asked in: JEE Advanced 2015 (Paper 1)

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