JAMB Chemistry 2019 Objective — Question 24

Question 24 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

The presence of NaCl in ice will

A. lower the boiling point of NaCl
B. raise the melting point of ice
C. lower the melting point of iceCorrect
D. have no effect

Explanation

An impurity raises the boiling point of a liquid but lowers the melting point of a solid. Adding NaCl to ice lowers its melting point, causing the ice to melt below 0°C.

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