Assertion : $[S c (H_{2} O)_{6}]^{3 +}$ is colourless. Reason: d-d transition is not possible in $[S c (H_{2} O)_{6}]^{3 +}$

Assertion is true but the reason is false.

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Assertion is false but the reason is true.

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Both assertion and reason are true and the reason is a correct explanation of assertion.

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Both assertion and reason are true but reason is not a correct explanation of assertion.

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Solution

The correct option is C Both assertion and reason are true and the reason is a correct explanation of assertion.
$[S c (H_{2} O)_{6}]^{3 +}$ contain $S c^{3 +}$ ion. It has $3 d^{0}$ configuration and contains 0 unpaired electrons. Hence the complex is colorless.

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Assertion :[Sc(H2O)6]3+ is colourless. Reason: d-d transition is not possible in [Sc(H2O)6]3+

The correct option is C Both assertion and reason are true and the reason is a correct explanation of assertion.[Sc(H2O)6]3+ contain Sc3+ ion. It has 3d0 configuration and contains 0 unpaired electrons. Hence the complex is colorless.

Assertion : $[S c (H_{2} O)_{6}]^{3 +}$ is colourless. Reason: d-d transition is not possible in $[S c (H_{2} O)_{6}]^{3 +}$

The correct option is C Both assertion and reason are true and the reason is a correct explanation of assertion.
$[S c (H_{2} O)_{6}]^{3 +}$ contain $S c^{3 +}$ ion. It has $3 d^{0}$ configuration and contains 0 unpaired electrons. Hence the complex is colorless.