Which of the following are main requirements for vapour phase refining?
(i) Metal should form a volatile compound with the reagent.
(ii) The volatile compound should be easily decomposable to give back pure metal.
(iii) Metal should be very reactive and form a stable compound with the reagent.

(i), (ii) and (iii)

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(i) and (ii)

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(ii) and (iii)

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(i) and (iii)

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Solution

The correct option is A (i) and (ii)
In this method, the metal is converted into its volatile compound which is collected and decomposed to give pure metal. So, the two requirements are:
(i) the metal should form a volatile compound with an available reagent,
(ii) the volatile compound should be easily decomposable so that the recovery is easy.
It is not necessary for metal to be very reactive and form a stable compound with the reagent in vapour phase refining.
Hence, option B is the correct answer.

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Which of the following are main requirements for vapour phase refining?(i) Metal should form a volatile compound with the reagent.(ii) The volatile compound should be easily decomposable to give back pure metal.(iii) Metal should be very reactive and form a stable compound with the reagent.

Which of the following are main requirements for vapour phase refining?
(i) Metal should form a volatile compound with the reagent.
(ii) The volatile compound should be easily decomposable to give back pure metal.
(iii) Metal should be very reactive and form a stable compound with the reagent.