The emf E° of the following cells are: Ag | Ag +(1 M ) | Cu 2+(1 M )| Cu ; E°=-0.46 V Zn | Zn 2+(1 M ) | Cu 2+(1 M )| Cu ; E°=1.10 V emf of the following cell is Zn | Zn 2+(1 M ) | Ag +(1 M )| Ag

Question

The emf E° of the following cells are: Ag | Ag +(1 M ) | Cu 2+(1 M )| Cu ; E°=-0.46 V Zn | Zn 2+(1 M ) | Cu 2+(1 M )| Cu ; E°=1.10 V emf of the following cell is Zn | Zn 2+(1 M ) | Ag +(1 M )| Ag (A) 0.64 V (B) 1.10 V (C) 1.56 V (D) -0.64 V

Tardigrade Admin · Accepted Answer

E Cu 2+ / Cu °-E Ag + / Ag °=-0.46 V ...(i) E Cu 2+ / Cu °-E Zn 2+ / Zn °=1.10 V ...(ii) On subtracting Eq (i) from equation (ii), we get E Ag + / Ag °-E Zn 2+ / Zn °=+1.56 V

Q. The emf E∘ of the following cells are : Ag∣∣​Ag+(1M)∥Cu2+(1M)∣∣​Cu;E∘=−0.46V Zn∣∣​Zn2+(1M)∥Cu2+(1M)∣∣​Cu;E∘=1.10V emf of the following cell is Zn∣∣​Zn2+(1M)∥Ag+(1M)∣∣​Ag

0.64 V

1.10 V

1.56 V

-0.64 V

ECu2+/Cu∘​−EAg+/Ag∘​=−0.46V ...(i) ECu2+/Cu∘​−EZn2+/Zn∘​=1.10V ...(ii) On subtracting Eq (i) from equation (ii), we get EAg+/Ag∘​−EZn2+/Zn∘​=+1.56V

$E_{C u^{2 +} / C u}^{\circ} - E_{A g^{+} / A g}^{\circ} = - 0.46 V$ ...(i)
$E_{C u^{2 +} / C u}^{\circ} - E_{Z n^{2 +} / Z n}^{\circ} = 1.10 V$ ...(ii)
On subtracting Eq (i) from equation (ii), we get
$E_{A g^{+} / A g}^{\circ} - E_{Z n^{2 +} / Z n}^{\circ} = + 1.56 V$