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NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

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Question : 38 of 43
Marks: +1, -0
[NiCl4]2–[NiCl_4] ^{2–} is paramagnetic while [Ni(CO)4][Ni(CO)_4] is diamagnetic though both are tetrahedral. Why?
Solution:  
In Ni(CO)4Ni(CO)_4, Ni is in zero oxidation state whereas in NiCl42–NiCl_4 ^{2–}, it is in +2oxidation state. In the presence of CO ligand, the unpaired d-electrons ofNi pair up but Cl–^{–}being a weak ligand is unable to pair up the unpairedelectrons.
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