Physics
State the effect of presence of impurity on the melting point of ice. Give one use of it.
Calorimetry
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Answer
The melting point of a substance decreases by the presence of impurities in it. The melting point of ice decreases from 0 ° C to -22 ° C on mixing salt to it in proper proportion. This fact is utilized in making the freezing mixture by adding salt to ice. The freezing mixture is used in preparing 'kulfis'.
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