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Q.

Requirement(s) for a metal to be refined by vapour phase refining is/are

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a

On heating the impurity should evaporate.

b

The metal should form a volatile compound with a suitable reagent and the compound thus formed should be easily decomposable.

c

On heating with an available reagent, the impurity should form a volatile compound.

d

Metal should have higher melting point than the impurity.

answer is C.

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Detailed Solution

The metal should form a volatile compound with a suitable reagent and the compound thus formed should be easily decomposable. Nickel is purified by this process, well known as Monds process.

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Requirement(s) for a metal to be refined by vapour phase refining is/are