Question

you are given two samples of water labelled as 'A' and 'B'. Sample 'A' boils at 100°Cha and sample 'B' boils at 102°C. Which sample of water will not freeze at 0°C ?

Answer 1

102 will not freeze because its boiling point is 102 degree celcius

Answer 2

It is because sample ‘B’ boils at 102°C while the boiling point of pure water is 100°C. It means this sample contains impurities. Only pure substance has sharp melting point.