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Q.

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

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a

$K_{3} [Cu (CN)_{4}]$

b

$K_{2} [Cu (CN)_{4}]$

c

$K_{3} [Fe (CN)_{4}]$

d

$K_{4} [{FeCl}_{6}]$

answer is A.

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Detailed Solution

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$K_{3} [Cu (CN)_{4}]$

O.N. of copper is ${Cu}^{+ 1}$

${Cu}^{+ 1} = [Ar] 3 d^{10} \Rightarrow Diamagnetic$

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