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Electrolytic Refining of Copper

Impure metal ...

Question

Impure metal forms a volatile compound (X) with CO then on heating (X) gives pure metal.

The Metal is :

A

Cu

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B

Fe

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C

Ni

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D

Pt

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Solution

The correct option is C Ni
Reaction:
$N i + 4 C O \to N i (C O)_{4} h e a t - - \to N i + 4 C O$

The process is known as Mond Process.

So, the correct option is (C)

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50^{\circ} C

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(i) Metal should form a volatile compound with the reagent.
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Q. Impure Metal

+ I_{2} \to

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The above method of purification is :

Q. Assertion :Van-Arkel method is used to prepare samples of some metals. Reason: It involves the reaction of CO with metals to form volatile carbonyls that decompose on heating to give pure metal.

Read the above assertion and reason and choose the correct option regarding it.

Q. Refining an impure metal to give a pure metal is known as:

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