Ncert Exercises & Solutions

Write two basic requirements for refining of a metal by Mond’s process and by van Arkel Method.

NEETprep Answer:

Two basic requirements are

(i) Metal shoutd form volatile compound with available reagent.
(ii) The volatile compound should be easily decomposable so that it can be recovered easily.

(a) Mond’s process includes conversion of

Ni to Ni {(CO)}_{4}

and then decomposition of

Ni {(CO)}_{4} to Ni

Ni + 4 CO \to Ni {(CO)}_{4}

Ni {(CO)}_{4} \overset{450 - 470 K}{\to} Ni + 4 CO

(b) van Arkel method includes conversion of

Zr

to volatile

{ZrI}_{4}

and then decomposition of

{ZrI}_{4}

Zr

and

I_{2}

Zr + 2 I_{2} \overset{870 K}{\to} {ZrI}_{4} \overset{2075 K}{\to} Zr + 2 I_{2}

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