SATHEE: Electrochemistry - Result Question 58

Electrochemistry - Result Question 58

####60. A button cell used in watches functions as following

$\begin{aligned} Z n (s) + A g_{2} O (s) + H_{2} O (l) \to \\ 2 A g (s) + Z n^{2 +} (a q) + 2 O H^{-} (a q) \end{aligned}$

If half cell potentials are :

$Z n^{2 +} (a q) + 2 e^{-} \to Z n (s); E^{0} = - 0.76 V$

$A g_{2} O (s) + H_{2} O (l) + 2 e^{-} \to 2 A g (s) +$

$2 O H^{-} (a q); E^{o} = 0.34 V$ The cell potential will be :

(a) $0.42 V$

(b) $0.84 V$

(c) $1.34 V$

(d) $1.10 V$

[NEET 2013]

Show Answer

Solution:

(d) $E_{Cell}^{\circ} = E_{O P}^{\circ} + E_{R P}^{\circ} = 0.76 + 0.34 = 1.10 V$

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