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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Physical properties of isotopes of hydrogen are different. Reason R: Mass difference between isotopes of hydrogen is very large. In the light of the above statements, choose the correct answer from the options given below:

1. Both A and R are true and R is the correct explanation of A
2. A is false but R is true
3. A is true but R is false
4. Both A and R are true but R is NOT the correct explanation of A

Correct answer: Both A and R are true and R is the correct explanation of A

Solution

The assertion is correct because isotopes of hydrogen, such as protium, deuterium, and tritium, exhibit different physical properties due to their varying masses. The reason is also true, as the significant mass difference between these isotopes leads to observable variations in their physical properties, making it a valid explanation for the assertion.

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