JEE Main 2025 (8 Apr, Shift 2) Chemistry Q75: Consider the…

Question

Consider the following half cell reaction
$\mathrm{Cr_2O_7^{2-}(aq) + 6e^- + 14H^+(aq) \longrightarrow 2Cr^{3+}(aq) + 7H_2O(l)}$
The reaction was conducted with the ratio of $\frac{[\mathrm{Cr^{3+}}]^2}{[\mathrm{Cr_2O_7^{2-}}]} = 10^{-6}$. The pH value at which the EMF of the half cell will become zero is __________. (nearest integer value)
[Given : standard half cell reduction potential $E^\circ_{\mathrm{Cr_2O_7^{2-},H^+/Cr^{3+}}} = 1.33$V, $\frac{2.303RT}{F} = 0.059$V.]

Accepted Answer

10

JEE Main 8 April 2025, Shift 2, Chemistry Q75

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