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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc051

Which of the following comparisons of crystal field splitting are correct?

A $Δ_{o}$ of $[Cr (NH X_{3}) X_{6}] X^{3 +}$ is greater than $Δ_{o}$ of $[Cr (H X_{2} O) X_{6}] X^{3 +}$ .
B $Δ_{o}$ of $[Co (NH X_{3}) X_{6}] X^{3 +}$ is greater than $Δ_{o}$ of $[Co (NH X_{3}) X_{6}] X^{2 +}$ .
C $Δ_{o}$ of $[Rh (NH X_{3}) X_{6}] X^{3 +}$ is smaller than $Δ_{o}$ of $[Co (NH X_{3}) X_{6}] X^{3 +}$ .
D $Δ_{o}$ of $[Fe (H X_{2} O) X_{6}] X^{3 +}$ is greater than $Δ_{o}$ of $[Fe (H X_{2} O) X_{6}] X^{2 +}$ .

Answer: A, B, D

Ammonia lies above water in the spectrochemical series, so statement 1 is true. A higher oxidation state with the same ligand gives a larger

Δ_{o}

(statements 2 and 4). Statement 3 is false: 4d metals have larger splitting than 3d metals, so Rh(III) exceeds Co(III).

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