Question

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

• A. (i), (ii) and (iii)
• B. (i) and (ii)
• C. (ii) and (iii)
• D. (i) and (iii)

Answer 1

Answer: (B)

(i) and (ii)

Answer 2

$\mathrm { M } + \mathrm { A } \longrightarrow \mathrm { MA }$ (volatile)

$\mathrm { MA } \xrightarrow { \Delta } \mathrm { M } + \mathrm { A }$

(Where M is metal and A is the available reagent)