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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