Assertion :The activity of 1 g pure uranium-235 will be greater than the same amount present as $U_{3} O_{8}$ . Reason: In the combined state, the activity of the radioactive element decreases.

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 D Both Assertion and Reason are incorrect
The activity of 1g of pure $U - 235$ and that in $U_{3} O_{8}$ is same. Activity does not depend upon the state of combination.

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Assertion :The activity of 1 g pure uranium-235 will be greater than the same amount present as U3O8. Reason: In the combined state, the activity of the radioactive element decreases.

The correct option is D Both Assertion and Reason are incorrectThe activity of 1g of pure U−235 and that in U3O8 is same. Activity does not depend upon the state of combination.

Assertion :The activity of 1 g pure uranium-235 will be greater than the same amount present as $U_{3} O_{8}$ . Reason: In the combined state, the activity of the radioactive element decreases.

The correct option is D Both Assertion and Reason are incorrect
The activity of 1g of pure $U - 235$ and that in $U_{3} O_{8}$ is same. Activity does not depend upon the state of combination.