Q6 / 90 · JEE Main 2023 (10 Apr Shift 2) · Chemistry

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:

  • Correct answer
    A
    Both A and R are true and R is the correct explanation of A 
  • B
    A is false but R is true
  • C
    A is true but R is false
  • D
    Both A and R are true but R is NOT the correct explanation of A

Solution

The isotopes of hydrogen are protium, deuterium, and tritium, which have different physical properties. For example, deuterium has a higher boiling point and a lower vapor pressure than protium, while tritium is radioactive and has a much shorter half-life than the other two isotopes.

The mass difference between the isotopes of hydrogen is indeed significant, with protium having a mass of 1 atomic mass unit (amu), deuterium having a mass of 2 amu, and tritium having a mass of 3 amu.

So Both A and R are true and R is the correct explanation of A.

Hence, the correct answer is option: 'A'.

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