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, chose the correct answer from the options given below:
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, chose the correct answer from the options given below:
- (A)A is false but R is true.
- (B)Both A and R are true and R is the NOT the correct explanation of A.
- (C)A is true but R is false.
- (D)Both A and R are true and R is the correct explanation of A.✓ Correct
Answer: (D)
Solution
Hydrogen has three isotopes: protium (¹H), deuterium (²H), and tritium (³H). The mass ratios (1:2:3) are exceptionally large compared to isotopes of heavier elements. Physical properties like boiling point, melting point, and density depend on mass, so hydrogen isotopes show significant differences in these properties. Both statements are true, and the large mass difference (Reason R) correctly explains why the physical properties differ (Assertion A).
JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Single correct option