Give reasons:
Sea water does not freeze at 0°C.
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The presence of impurities in water lowers its freezing point. Sea water contains salt which lowers the freezing point of water. So sea water does not freeze at 0°C.
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It is difficult to cook in hills as compared to plains.
Ice floats on water.
What is the effect on boiling point of water when:
(a) pressure is increased?
(b) impurity is added?
Explain the terms:
(a) Solution
(b) Solute
(c) Solvent