A) iron
B) nickel
C) cobalt
D) tungsten
Correct Answer: B
Solution :
\[Ni\]combines with CO to form volatile \[Ni{{(CO)}_{4}}\]which decomposes to give pure Ni metal and CO on heating. \[\underset{volatile}{\mathop{Ni{{(CO)}_{4}}}}\,\xrightarrow[{}]{heat}\underset{metal}{\mathop{Ni}}\,+4CO\uparrow \]
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