Which one of the following is an inner orbital complex as well as diamagnetic in behavior?

[Z n (N H_{3})_{6}]^{+ 2}

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[N i (N H_{3})_{6}]^{+ 2}

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[C r (N H_{3})_{6}]^{+ 3}

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[C o (N H_{3})_{6}]^{+ 3}

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Solution

The correct option is D $[C o (N H_{3})_{6}]^{+ 3}$
$[C o (N H_{3})_{6}]^{+ 3}$ is an inner orbital Octahedral complex with $C o^{+ 3}$ containing $d^{6}$ configuration where all the electrons are paired up with in the 3d level making it diamagnetic.

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[C o (N H_{3})_{6}]^{3 +}

[N i (N H_{3})_{6}]^{2 +}

[C o (N H_{3})_{6}]^{3 +}

[M n F_{6}]^{3 -}

[C o (C N)_{6}]^{3 -}

[C r (N H_{3})_{6}]^{3 +}

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