The oxidation potentials of Zn, Cu, Ag, H2 and Ni are 0.76, -0.34, -0.80,0.00,0.25 volt, respectively. Which of the following reactions will provide maximum voltage?

Question

The oxidation potentials of Zn, Cu, Ag, H2 and Ni are 0.76, -0.34, -0.80,0.00,0.25 volt, respectively. Which of the following reactions will provide maximum voltage? (A) Zn + Cu2+ → Cu + Zn2+ (B) Zn + 2Ag+ → 2Ag + Zn2+ (C) H2 + Cu2+ → 2H+ + Cu (D) H2 + Ni2+ → 2H+ + Ni

Tardigrade Admin · Accepted Answer

E°cell = 0.8 - ( - 0.76) = 1.56 V Maximum voltage is produced when electrode having minimum oxidation potential is made cathode and maximum oxidation potential is made anode.

Q. The oxidation potentials of $Z n, C u, A g, H_{2}$ and Ni are $0.76, - 0.34, - 0.80, 0.00, 0.25$ volt, respectively. Which of the following reactions will provide maximum voltage?

$Z n + C u^{2 +} \to C u + Z n^{2 +}$

$Z n + 2 A g^{+} \to 2 A g + Z n^{2 +}$

$H_{2} + C u^{2 +} \to 2 H^{+} + C u$

$H_{2} + N i^{2 +} \to 2 H^{+} + N i$

$E °_{ce ll} = 0.8 - (- 0.76) = 1.56 V$
Maximum voltage is produced when electrode having minimum oxidation potential is made cathode and maximum oxidation potential is made anode.

Q. The oxidation potentials of Zn,Cu,Ag,H2​ and Ni are 0.76,−0.34,−0.80,0.00,0.25 volt, respectively. Which of the following reactions will provide maximum voltage?

Zn+Cu2+→Cu+Zn2+

Zn+2Ag+→2Ag+Zn2+

H2​+Cu2+→2H++Cu

H2​+Ni2+→2H++Ni