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NEET levelSingle correct optionDifficulty 1 of 3mt167

Impure nickel is converted into a volatile compound by passing carbon monoxide over it at about 330-350 K in the Mond process. The volatile compound is

A $Ni X_{2} (CO) X_{3}$
B $NiCO X_{3}$
C $Ni (CO) X_{6}$
D $Ni (CO) X_{4}$

Answer: D

Nickel reacts with CO as

Ni + 4 CO Ni (CO) X_{4}

. The tetracarbonyl is volatile and later decomposes at 450-470 K to give pure nickel.

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