WAEC Chemistry 2011 Objective — Question 30

Question 30 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

When NH4Cl was dissolved in water, the container was cold to touch. This implies that the process is

A. A. endothermicCorrect
B. B. the process is exothermic
C. C. NH4Cl is highly soluble in water
D. D. NH4Cl forms a saturated solution

Explanation

Since the container was cold to touch, heat was absorbed from the surroundings - i.e. the dissolution is an endothermic process. An exothermic process would make the container feel warm/hot.

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