Test Index

JAMB Chemistry 2015 Paper

Question : 50

Total: 64

Solution:

Concept:

Salt lowers the freezing point of water, helping ice melt on roads in cold countries.

Explanation:

When the temperature falls below

273\ \mathrm{K}

(

0^\circ\mathrm{C}

), water on roads freezes.

Spreading salt on the ice creates a solution with a lower freezing point than pure water.

This means the ice melts even though the temperature is still below the normal freezing point of water.

Answer:

D. reduce the freezing point of ice

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