Question 21 You are given two samples of water labelled as 'A' and 'B'. Sample 'A' boils at 100∘C and sample 'B' boils at 102∘C. Which sample of water will not freeze at 0∘C?
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Solution
Sample 'B' will not freeze at 0∘C as it is impure water. 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 substances have sharp melting point.