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JAMB Chemistry 1995 Question 18

Question 18

Solubility and Solutions

In general, an increase in temperature increases the solubility of a solute in water because

  1. A.more solute molecules collide with each other
  2. B.most solutes dissolve with the evolution of heat
  3. C.more solute molecules dissociate at higher temperatures
  4. D.most solutes dissolve with absorption of heat
Show the answer and explanation

Answer: D (most solutes dissolve with absorption of heat)

Explanation

For most solids, dissolving absorbs heat (it is endothermic). By Le Chatelier's principle, raising the temperature favours the heat-absorbing process, so more solute dissolves.