Assertion :Transition metal compounds are often colored.
Reason: They frequently possess partially filled $d$ orbitals.

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

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

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
According to the definition of transition metals they have partially filled d orbitals and we know that when electron jumps from one orbital to another orbital, light is emitted due to which the compounds of transitional elements are usually coloured

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Assertion :Transition metal compounds are often colored. Reason: They frequently possess partially filled d orbitals.

Assertion :Transition metal compounds are often colored.
Reason: They frequently possess partially filled $d$ orbitals.