Assertion (A) : ${[T i {(H_{2} O)}_{6}]}^{3 +}$ is coloured while ${[S c {(H_{2} O)}_{6}]}^{3 +}$ is colour less
Reason (R) : d-d transition are possible in ${[S c {(H_{2} O)}_{6}]}^{3 +}$

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

Both Assertion and Reason are incorrect

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

Assertion is correct but Reason is incorrect

answer is C.

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Detailed Solution

${[S c {(H_{2} O)}_{6}]}^{3 +}$ has no unpaired electron in its d-subshell and thus d-d transition is not possible.

${[T i {(H_{2} O)}_{6}]}^{3 +}$ has one unpaired electron in its d-subshell which gives rise to d-d transition.

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