Solubility of a solute in a solvent (say, water) is dependent on temperature as given by S = A.e^(-ΔH/RT), where ΔH is heat of reaction: solute + H₂O ⇌ solution. For a given solution, variation of log

Question

Solubility of a solute in a solvent (say, water) is dependent on temperature as given by S = A.e^(-ΔH/RT), where ΔH is heat of reaction: solute + H₂O ⇌ solution. For a given solution, variation of log S with temperature is shown graphically. The solute should be

Prashant Kotian · Accepted Answer

Correct answer: D. Taking the log of the given equation yields log S = log A - (ΔH / 2.303R)(1/T). A positive slope for the graph of log S vs (1/T) implies that -ΔH / 2.303R > 0, meaning ΔH is negative (the dissolution process is exothermic). Among the given options, the dissolution of CaO is exothermic. Therefore, correct answer is D.

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