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Which of the following complexes is expected to have lowest $Δ_{o}$ value?

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

${[C o F_{6}]}^{3 -}$

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

${[R h {(N H_{3})}_{6}]}^{3 +}$

answer is D.

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Detailed Solution

Hint: $3 d \to 4 d \to 5 d : Δ_{o}$ increases
${[C o F_{6}]}^{3 -} < {[C o {(N H_{3})}_{6}]}^{3 +} < {[R h {(N H_{3})}_{6}]}^{3 +} < {[I r {(N H_{3})}_{6}]}^{3 +}$

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