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Blazing goIITian

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30 Nov 2011 10:06:31 IST

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A current passing through copper voltameter deposit 0.0002Kg of cpooer on cathode plate in

Physics

A current passing through copper voltameter deposit 0.0002Kg of cpooer on cathode plate in 100min . If there are 10²⁵ atoms in 1kg of copper , electric charge delivered to the cathode in Cu ions per second will be

a) 0.75C b) 0.71C c) 1.06C d) 10.06C

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Arjun Virmani

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Joined: 1 Jun 2009

Posts: 1294

31 Jan 2012 23:42:01 IST

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Mass of Cu deposited = 0.0002 kg per 100 min = 0.2 g in 6000 sec = 1 / 30000 g /sec

Atoms deposited per sec (1kg contain 10²⁵, thrfr 1 g contain 10²³) = 1/ 3000 * 10²³

Charge per atom = +2e = 2 * 1.60217646 × 10^-19C.

Charge deposited per sec = (1/ 3000 * 10²³) * (2 * 1.60217646 × 10^-19) = ( 3.204 / 3 ) = 1.06 C..!!

ans!!

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