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  • In which of the following method of purification, metal is converted to its volatile compound which is decomposed to give pure metal? (i) heating with a stream of carbon monoxide. (ii) heating with iodine. (iii) liquation. (iv) distillation.

In which of the following method of purification, metal is converted to its volatile compound which is decomposed to give pure metal?

(i) heating with a stream of carbon monoxide.

(ii) heating with iodine.

(iii) liquation.

(iv) distillation.

Answers (1)

The answer is the option (i,ii)

(i) Heating of metal with stream of \text {CO}

\text {Ni}+\text {4CO}\rightarrow \text {Ni}\text {(CO)}_{4}\overset{450-470\text {k}}{\rightarrow}\text {Ni+4CO}\; \; \text {Mond's Process}

(ii) Heating with Iodine

\text {Zr+2I}_{2}\overset{870\text {k}}{\rightarrow}\text {ZrI}_{4}\overset{2075\; \text {K}(Tungsten filament)}{\rightarrow}\text {Zr+2I}_{2}\text {(van arkel method)}

 

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