Assertion: The most common oxidation state exhibited by actinoids is +2. Reason: All actinoids possess two electrons in 7s subshell.

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If Assertion is INCORRECT but Reason is CORRECT. Explanation: The Assertion is incorrect because the most common oxidation state of actinoids is +3, not +2. The Reason is correct, as all actinoids do possess two electrons in the 7s subshell, but this does not make +2 the most common oxidation state.

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