The heating process for the extraction of elements are quite old but highly acceptable method for the extraction of elements. Become in this process the elements produced is in the highly pure state. Mostly `As, Sb,Ni, Zr,B` etc are prepared by this principle 4 mumber of metal sulphides which may be reated first in air to partially convert them to the aride, and then further roasted in the absence of air, wing self reduction.
How does impure Ni is purified

Options

A. impure `Ni+CO_(2) to NiCO_(3) overset(Delta) to NiO+CO_(2) overset(Delta) to Ni(s)`
B. impure `Ni+CO overset(50^(@)C) to Ni(CO)_(3)(g) overset(Delta) to Nis+Co(g) overset("Condensation") to Ni(s)` pure
C. impure `Ni+CO_(2) overset(50^(@)C) toNi(CO)_(4),(s) overset(Delta) toNi(s)+CO(g)`
D. impure `Ni+CO overset(50^(@)C) to Ni(CO)_(4) (g) overset(30^(@)C) to Ni(c) +CO(g)`

Answer

B

Explanation

Monds process : Condensation
`underset("1m pure")(Ni)+4CO to Ni(CO)_(4) overset(Delta) to underset(Ni("pure")) underset(dar "condensation")(Ni_(g))+4CO`