Melting point, enthalpy of vapourisation and viscosity data of H₂O and D₂O is given below :

On the basis of this data explain in which of these liquids intermolecular forces are stronger?

We know, melting point, enthalpy of vapourisation, viscosity all these physical properties depend on the intermolecular forces of attraction. From the data supplied above, we can see that all the values corresponding to the properties are higher for D₂O than that of H₂O. So, we can say that the intermolecular forces in D₂O are stronger.