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NVAMediumJEE Main 2026 · 22 January, Shift 2Nernst Equation

Chemistry Question from JEE Main 2026 · 22 January, Shift 2

Consider the following electrochemical cell: Pt ∣ O2(g,1 bar) ∣ HCl(aq) ∣∣ M2+(aq,1.0 M) ∣ M(s)\mathrm{Pt \ | \ O_2(g,1\,bar) \ | \ HCl(aq) \ || \ M^{2+}(aq,1.0\,M) \ | \ M(s)} The pH above which oxygen gas would start to evolve at the anode is _____ (nearest integer).

Given: EM2+/M∘=0.994 VE^\circ_{\mathrm{M^{2+}/M}} = 0.994\,V EO2/H2O∘=1.23 VE^\circ_{\mathrm{O_2/H_2O}} = 1.23\,V RTF(2.303)=0.059 V\frac{RT}{F}(2.303)=0.059\,V

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