(a) The physical state of water at `25^(@)C` is liquid.
(b) `0^(@)C` is the melting point of ice (which is a solid) as well as the freezing point of water (which is a liquid). So, the physical state of water at `0^(@)C` can be either a solid (as ice) or liquid).
(c ) `100^(@)C` is the boiling point of water (which is a liquid) as well as the condensation temperature of steam (which is a gas). So, the physical state of water at `100^(@)C` can be either a liquid or a gas (steam).
