Question

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?

Comment.​

Answer 1

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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.

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Answer 2

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The boiling point of pure water is 100 degree Celsius. Here Sample A is able to boil at the temperature of 100 degree Celsius while Sample B is boiling at the 102 degree Celsius. This only means that Sample B is not a pure water and is mixed up with some other solvent. Hence, it won't freeze at 0 degree Celsius