$A$ sample of water contains sodium chloride. It is:

Which compound produces $H_2$ gas in an aqueous solution?

Which of the following statements does not define the characteristic property of water,"Water is a universal solvent"?

Melting point,enthalpy of vaporisation and viscosity data of $H_2O$ and $D_2O$ is given below.

$Property$	$H_2O$ vs $D_2O$
$Melting$ $point/K$	$273.0$ vs $276.8$
$Enthalpy$ $of$ $vaporisation$ $at$ $(373 \ K) / kJ \ mol^{-1}$	$40.66$ vs $41.61$
$Viscosity/centipoise$	$0.8903$ vs $1.107$

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

The photolysis of water gives the substance

The substance used as a universal solvent is .....