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  4. The metal complex that is diamagnetic is (Atomic number: Fe , 26 ; Cu , 29 )

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Q. The metal complex that is diamagnetic is (Atomic number : $Fe , 26 ; Cu , 29$ )

JEE MainJEE Main 2022Coordination Compounds

Solution:

$K _3\left[ Cu ( CN )_4\right]$
O.N. of copper is $Cu ^{+1}$
$Cu ^{+1}=[ Ar ] 3 d ^{10} \Rightarrow $ Diamagnetic