A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.
No, the water is not pure. It contains some non-volatile impurities dissolved due to which water boils at a temperature higher than normal boiling point. And, its freezing point will be below 0°C due to the presence of a non-volatile impurity in it.
Non-Volatile impurities are those substances which do not evaporate easily on boiling the liquid. Also, the presence of impurities lowers the vapour pressure of the original liquid which cause the lowering of freezing point of the liquid.