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Assertion : $\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ is coloured while $\left[\mathrm{Sc}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ is colourless
Reason : $d-d$ transition is not possible in $\left[\mathrm{Sc}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$.
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Reason : $d-d$ transition is not possible in $\left[\mathrm{Sc}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$.
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If both assertion and reason are true and the reason is the correct explanation of the assertion.
Both assertion and reason are true and reason is the correct explanation of assertion. has no unpaired electron in its subshell and thus transition is not possible whereas has one unpaired electron in its subshell which gives rise to transition to impart colour.
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