Assertion :Mendeleev's periodic table have some demerits. Reason: There was no place for all isotopes of the elements and some heavy elements were placed before lighter elements.

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
The drawbacks of Mendeleev's periodic table are:
1) There was no place for all isotopes of the elements.
2) Some heavy elements were placed before lighter elements.

Option A is correct.

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