Q29 / 160 · TS EAMCET 2023 (13 May Shift 1) · Chemistry

$\mathrm{Cr}^{2+}$ and $\mathrm{Mn}^{3+}$ do possess $\mathrm{d}^4$ electronic configuration. So,

  • Correct answer
    A
    $\mathrm{Mn}^{3+}$ is oxidizing agent while $\mathrm{Cr}^{2+}$ is reducing agent
  • B
    Both are reducing agents
  • C
    $\mathrm{Mn}^{3+}$ is reducing agent while $\mathrm{Cr}^{2+}$ is oxidizing agent
  • D
    Both are oxidizing agents

Solution

$\mathrm{Mn}$ is stable in +2 state so $\mathrm{Mn}^{3+}$ acts as an oxidizing agent by getting reduced to $\mathrm{Mn}^{2+}$ and attaining $\mathrm{d}^5$ configuration. $\mathrm{Cr}$ is stable in +3 state so $\mathrm{Cr}^{2+}$ acts as a reducing agent by getting oxidized to $\mathrm{Cr}^{3+}$.

Hence, the correct answer is option: 'A'.

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