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  4. Which property among the following is same for both hydrogen and deuterium molecules?

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Q. Which property among the following is same for both hydrogen and deuterium molecules?

Bihar CECEBihar CECE 2014Hydrogen

Solution:

Both hydrogen $ ({{H}_{2}}) $ and deuterium $ ({{D}_{2}}) $ molecules have same bond length but have different bond energy, melting point and boiling Point.
Property
Hydrogen $ \mathbf{(}{{\mathbf{H}}_{\mathbf{2}}}\mathbf{)} $ 74pm
Deuterium (P2) $ \mathbf{(}{{\mathbf{D}}_{\mathbf{2}}}\mathbf{)} $ 74pm
Bond energy
$ \text{436kJ mo}{{\text{l}}^{\text{-1}}} $
$ \text{443}.\text{3kJ mo}{{\text{l}}^{\text{-1}}} $
M.P.
$ 0.00{}^\circ \text{C} $
$ \text{3}.\text{81}{}^\circ \text{C} $
B.P.
$ \text{1}00.0{}^\circ \text{C} $
$ \text{1}0\text{1}.\text{42}{}^\circ \text{C} $