JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर JEE PYQ-Current Electricity Charging and Discharging of Capacitors

The negative Zn-pole of Daniell cell, sending a constant current through a circuit, decreases in mass by \[0.13\]g in 30 min. If the electrochemical 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 AIEEE 2003]

A) \[0.180\] g

B) \[0.141\] g

C) \[0.126\]g

D) \[0.242\] g

Correct Answer: C

Solution :

[c] According to Faraday's law of electrolysis,

m = Zit, \[\frac{{{m}_{Zn}}}{{{m}_{Cu}}}=\frac{{{Z}_{Zn}}}{{{Z}_{Cu}}}\]

\[\therefore \] \[\frac{0.13}{{{m}_{Cu}}}=\frac{32.5}{31.5}\]

\[{{m}_{Cu}}=0.126\,\,g\]