Assertion : $Δ_{o}$ increases in the order of $[C r C l_{6}]^{3 -} < [C r (C N)_{6}]^{3 -} < [C r (C_{2} O_{4})_{3}]^{3 -}$ Reason: The stronger the ligand field, the higher will be $Δ_{o}$ value.

Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion

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Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion

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The Assertion is correct but the Reason is incorrect

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The Assertion is incorrect but the Reason is correct

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Solution

The correct option is D The Assertion is incorrect but the Reason is correct
According to the spectrochemical series, $C N^{-}$ is a strong field ligand, so it has more $Δ_{o}$ value.
So correct order of $Δ_{o}$ for these complex ions is:
$[C r C l_{6}]^{3 -} < [C r (C_{2} O_{4})_{3}]^{3 -} < [C r (C N)_{6}]^{3 -}$
Thus Assertion is incorrect but the Reason is correct.

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