Chemistry - Hydrogen and Its compound Question with Solution | TestHub
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Isotopes of hydrogen have almost same chemical properties, but difference in their rates of reaction.
Reason R : Isotopes of hydrogen have different enthalpy of bond dissociation.
In the light of the above statements, choose the most appropriate answer from the options given below:
Options:
Answer:
Solution:
Question Explanation: Assertion and reason on hydrogen isotopes.
Concept: Isotopic effects on chemical properties.
Solution:
Assertion A: Isotopes of hydrogen have almost the same chemical properties, but their reaction rates differ. This is a correct statement.
Reason R: Isotopes of hydrogen have different enthalpy of bond dissociation. This is also a correct statement. The kinetic isotope effect, where lighter isotopes react faster, is a direct consequence of the difference in their bond dissociation enthalpies. Therefore, R is the correct explanation for A.
