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Q.

Cadmium amalgam is prepared by electrolysis of a solution of CdCl2, using a mercury cathode. How long should a current of 4 A be passed in order to prepare 10% by weight of Cd in Cd-Hg amalgam on cathode of 4.5 g Hg? (atomic wt. of Cd : 112)

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a

400 sec

b

215.40 sec

c

861.6 sec

d

430.8 sec

answer is B.

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Detailed Solution

10 g Cd should deposit on 90 g Hg.
Weight of Cd required for 4.5 g of Hg cathode
W=1090×4.5=0.5g;  Cd2+2e−→Cd ∴0.5=112×4×t2×96500⇒   t=215.40sec

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