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The negative Zn pole of a Daniell cell, ...

The negative Zn pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electeochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive. Cu pole in this time is

A

0.180g

B

0.141 g

C

0.126 g

D

0.242 g

Text Solution

Verified by Experts

The correct Answer is:
C
(c) According to Faraday's first law of electrolysis
`m = Z xx q`
For same q, `m prop Z`
`:. (m_(Cu))/(m_(Zn)) = (Z_(Cu))/(Z_(Zn))`
`rArr m_(Cu) = Z_(Cu)/Z_(Zn) xx m_(Zn) = (31.5)/(32.5) xx 0.13 = 0.126g` .
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