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