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General Principles and processes of Isolation of Elements
hard
In the purification of impure nickel by Mond's process, metal is purified by
A
Electrolytic reduction
B
Vapour phase thermal decomposition
C
Thermite reduction
D
Carbon reduction
Solution
$\mathop {Ni}\limits_{(Impurity)} {\mkern 1mu} + {\mkern 1mu} 4CO{\mkern 1mu} $ $\xrightarrow{{50{\,^o}{\kern 1pt} to{\kern 1pt} \,\,60{{\kern 1pt} ^o}C}}\mathop {\left[ {Ni{{\left( {CO} \right)}_4}} \right]}\limits_{Volatile{\kern 1pt} Compound} \uparrow {\mkern 1mu} $ $\xrightarrow[{Themal{\kern 1pt} {\kern 1pt} decompotion}]{{200\,{\kern 1pt} to\,{\kern 1pt} 230{\kern 1pt} {{\kern 1pt} ^o}C}}\mathop {Ni}\limits_{pure} + {\mkern 1mu} 4CO{\mkern 1mu} \uparrow $
Standard 12
Chemistry
