A) hydride
B) chloride
C) azide
D) carbonyl
E) iodide
Correct Answer: D
Solution :
Nickel is purified by thermal decomposition of its carbonyl. This process is called Monds process. \[\underset{impure}{\mathop{Ni}}\,+4CO\xrightarrow[{}]{80{}^\circ C}\underset{\begin{smallmatrix} nickel \\ carbonyl \end{smallmatrix}}{\mathop{Ni{{(CO)}_{4}}}}\,\] \[Ni{{(CO)}_{4}}\xrightarrow{180{}^\circ C}\underset{Pure}{\mathop{Ni}}\,+4CO\uparrow \]
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