Given that array ll E _ Ni ^ 2+ / Ni ^ o =-0.25 ~V , & E _ Cu ^ 2+ / Cu ^ o =0.34 ~V , E…
Chemistry · JEE Advanced · NTA Exams — Electrochemistry
Given that
\[\begin{array}{ll} \mathrm{E}_{\mathrm{Ni}^{2+} / \mathrm{Ni}}^{\mathrm{o}}=-0.25 \mathrm{~V}, & \mathrm{E}_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\mathrm{o}}=0.34 \mathrm{~V}, \\ \mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\mathrm{o}}=0.80 \mathrm{~V}, & \mathrm{E}_{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{\mathrm{o}}=-0.76 \mathrm{~V} \end{array}\]
Which of the following reactions under standard conditions will not take place in the specified directions ?
\[\begin{array}{ll} \mathrm{E}_{\mathrm{Ni}^{2+} / \mathrm{Ni}}^{\mathrm{o}}=-0.25 \mathrm{~V}, & \mathrm{E}_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\mathrm{o}}=0.34 \mathrm{~V}, \\ \mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\mathrm{o}}=0.80 \mathrm{~V}, & \mathrm{E}_{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{\mathrm{o}}=-0.76 \mathrm{~V} \end{array}\]
Which of the following reactions under standard conditions will not take place in the specified directions ?
- Ni2+ (aq) + Cu (s) → Ni (s) + Cu2+ (aq)
- Cu (s) + 2Ag+ (aq) → Cu2+ (aq) + 2Ag (s)
- Cu (s) + 2H+ (aq) → Cu2+ (aq) + H2 (g)
- Zn (s) + 2H+ (aq) → Zn2+ (aq) + H2(g)
Answer
(A) Ni 2+ (aq) + Cu (s) → Ni (s) + Cu 2+ (aq), (C) Cu (s) + 2H + (aq) → Cu 2+ (aq) + H 2 (g)
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