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JEE Main levelOne or more correct optionsDifficulty 2 of 3mt178

The compound $Ni (CO) X_{4}$ formed in the Mond process has which of the following properties?

AThe hybridisation of nickel is $s p^{3}$
BIt is diamagnetic
CNickel is in the +4 oxidation state
DIts shape is tetrahedral

Answer: A, B, D

Ni is in oxidation state 0 (

3 d^{8} 4 s^{2}

rearranged to

3 d^{10}

). CO is a neutral ligand, so Ni stays 0. Four CO donate to

s p^{3}

orbitals giving a tetrahedral, diamagnetic complex. The +4 state is wrong.

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