Chemistry - Thermochemistry Question with Solution | TestHub
ChemistryThermochemistryEnthalpy of solution/dilution/hydrationMedium2 minQB
ChemistryMediumstatement
Statement 1: When a salt is dissolved in water, the temperature of solution decreases.
Statement 2: Solubility of any salt in water may be endothermic or exothermic.
Options:
Answer:
D
Solution:
The dissolution of a salt can be either exothermic or endothermic. For example, the dissolution of anhydrous CuSO₄ is exothermic, causing the solution to warm up. Conversely, the dissolution of NH₄NO₃ is endothermic, causing the solution to cool down. Therefore, the temperature does not necessarily decrease.
Statement 1 is incorrect because it implies a necessary temperature decrease. Statement 2 correctly states that the enthalpy of solution (Δ Hsol) may have either a positive or negative sign, depending on the specific salt.
The final answer is (d).
Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of solution/dilution/hydration
⏱ 2mℹ️ Source: QB
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