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Question

Assertion :α rays have greater ionizing power than β rays. Reason: α particles carry two unit positive charge while β particles carry only one unit negative charge.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
α rays have greater ionizing power (100 times) than β rays.

α particles are helium nuclei and carry two unit positive charge while β particles are electrons and carry only one unit negative charge.

Ionising power does not depend on the charges that a particle carries.

Thus, both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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