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 wt. 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 Present with 90 g H8.wt. of Cd required with 4.5 g of Hg at cathode=1090×4.5⇒0.5; Cd2+2e−→Cd ∴0.5112×2=4×t96500⇒t=215.40sec
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