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Q.

(A) : Both H2 and D2 have same internuclear distance
(R) : Enthalpy of bond dissociation is same for H2 and D2

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a

Both A and R are true, and R is correct explanation of A

b

Both A and R are true, and R is not the correct explanation of A

c

A is false but R is true

d

A is true but R is false

answer is A.

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Detailed Solution

The two isotopes have same atomic number therefore inter nuclear distance is same.

Bond dissociation energy (BDE) of D2(heavier isotope) is higher than H2(lighter isotope). 

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