NEET 2022

NEET 2022 Chemistry question on Redox and Electrochemistry

Given below are half cell reactions:
MnO4−+8H++5e−→Mn2++4H2O\text{MnO}_4^- + 8\text{H}^+ + 5e^- \rightarrow \text{Mn}^{2+} + 4\text{H}_2\text{O}, EMn2+/MnO4−∘=−1.510 VE^\circ_{\text{Mn}^{2+}/\text{MnO}_4^-} = -1.510\,\text{V}
12O2+2H++2e−→H2O\dfrac{1}{2}\text{O}_2 + 2\text{H}^+ + 2e^- \rightarrow \text{H}_2\text{O}, EO2/H2O∘=+1.223 VE^\circ_{\text{O}_2/\text{H}_2\text{O}} = +1.223\,\text{V}
Will the permanganate ion, MnO4−\text{MnO}_4^- liberate O2\text{O}_2 from water in the presence of an acid?
  1. A.
    Yes, because Ecell=+0.287 VE_\text{cell} = +0.287\,\text{V}
  2. B.
    No, because Ecell=−0.287 VE_\text{cell} = -0.287\,\text{V}
  3. C.
    Yes, because Ecell=+2.733 VE_\text{cell} = +2.733\,\text{V}
  4. D.
    No, because Ecell=−2.733 VE_\text{cell} = -2.733\,\text{V}
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Correct option: A

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