Question

van-Arkel method of purification of metals involves converting the metal to a

• A. volatile stable compound
• B. non-volatile stable compound
• C. volatile unstable compound
• D. None of the above

Answer 1

Answer: (A)

van-Arkel method of purification of metals involves conversion of an impure metal to a volatile stable compound.
$\underset{\text{impure method}}{\mathrm{Ti}}+2I_2\stackrel{500K}{\to }\underset{\text{volatile stable compound}}{Ti{I}_4}\stackrel{1700K}{\to }\underset{\text{pure metal}}{\mathrm{Ti}}+2I_2$