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For precipitation of silver from the com...

For precipitation of silver from the complex `[Ag(CN)_(2) ]^(-)` , zinc is used but not copper. Why?

Text Solution

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copper is also more electropositive than silver. Thus practically copper can also precipitate silver from `[Ag (CN)_(2)]^(-)` .
But Zinc is more electropositive when compared with copper and zinc is cheaper than copper .
Thus zinc is used commonly to precipitate silver from `[Ag(CN)_(2)]^(-)`
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