Assertion :All the isotopes of a given element show same chemical behaviour. Reason: Isotopes have different number of neutrons present in the nucleus.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Isotopes are defined as atoms with the same atomic number (protons or electrons) but different mass numbers (or neutrons). The mass number determines the physical properties such as boiling/melting/density etc. But chemical properties are governed by atomic number (number of electrons) and thus isotopes have similar chemical properties.
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Option $B$ is correct.

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