Lead obtained from galena ore (PbS) by air reduction or carbon reduction process contains base metal (Cu, Bi, As, Sn, Zn) as impurities. Gelatin acts as an addition agent in the electrolysis of Pb. In the presence of gelatin, Pb becomes :

hard and brittle

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soft and rubbery

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smooth and uniform

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only brittle

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Solution

The correct option is B smooth and uniform
Lead obtained contains impurities like $C u, S b, S n, A s, A g, A u, e t c .$ which make it hard. During electrolytic refining of lead, the electrolyte $(P b S i F_{6} + H_{2} S i F_{6})$ is mixed with a little gelatin. Gelatin is added for smooth and uniform deposition of lead in this process.

Hence, the correct option is (C).

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P b

S n

P b S

P b

A

P b S a i r - \to Δ P b O + S O_{2} C \to P b + C O_{2}

B

P b S a i r - \to Δ P b O + P b S \to P b + S O_{2}

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