Question
The isotopes of hydrogen have different physical properties due to difference in mass. They have almost same chemical properties with a difference in their rates of reactions which is mainly due to
A.
their different enthalpy of bond dissociation
B.
different electronic configurations
C.
different atomic masses
D.
different physical properties
Answer :
their different enthalpy of bond dissociation
Solution :
Enthalpy of bond dissociation of deuterium is higher $$\left( {443.35\,kJ\,mo{l^{ - 1}}} \right)$$ than hydrogen $$\left( {435.88\,kJ\,mo{l^{ - 1}}} \right).$$