Chemistry · PYQ NEET UG 2022

Given below are half cell reactions: \( \text{MnO}_4^- + 8\text{H}^+ + 5e^- \rightarrow \text{Mn}^{2+} + 4\text{H}_2\text{O}\,\,, E^\circ_{\text{Mn}^{2+}/\text{MnO}_4^-} = -1.510\text{ V} \) \( \frac{1}{2}\text{O}_2 + 2\text{H}^+ + 2e^- \rightarrow \text{H}_2\text{O}\,\,, E^\circ_{\text{O}_2/\text{H}_2\text{O}} = +1.223\text{ V} \) Will the permanganate ion, \( \text{MnO}_4^- \) liberate \( \text{O}_2 \) from water in the presence of an acid?

1. A
   Yes, because \( E^\circ_{\text{cell}} = +2.733\text{ V} \)
2. B
   No, because \( E^\circ_{\text{cell}} = -2.733\text{ V} \)
3. C
   Yes, because \( E^\circ_{\text{cell}} = +0.287\text{ V} \)
4. D
   No, because \( E^\circ_{\text{cell}} = -0.287\text{ V} \)