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Introduction to d and f Block Elements

Zinc is used ...

Question

Zinc is used to extract silver by solvent-extraction from molten lead by:

A

Solvay process

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B

Hall-Heroult process

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C

Parkes process

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D

Mond process

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Solution

The correct option is C Parkes process
Silver is removed by the Parkes process, which consists of adding zinc to the molten lead bullion. Zinc reacts rapidly and completely with gold and silver, forming very insoluble compounds that float to the top of the bullion.

Hence, option C is correct.

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Q. STATEMENT-1 : Silver extraction is done by dissolving its ore into cyanide solution.
STATEMENT-2 : In cyanide process, the silver is precipitated from soluble complex of silver of zinc-dust.

Q. Complexes formed in the following methods are:

(I) Mond's process for purification of nickel
(II)Removal of lead poisoning from the body
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(IV) Froth floatation process for separation of

Z n S

from galena are by using depressant

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is used in one of the steps during the extraction process of silver from silver coin.
State true or false

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