First slide

Sodium Chloride

Question

Statement -I : Common salt is deliquescent
Statement-II: Solubility of NaCl increases with increase in temperature

Difficult

A

Both statements I and II are correct
B

Statement-I is correct and statement-II is incorrect
C

Statement-I is incorrect and statement-II is correct
D

Both statements I and II are incorrect

Solution

Pure NaCl is not deliquescent. ${CaCl}_{2}$ and ${MgCl}_{2}$ present as impurities in NaCl are responsible for deliquescence;
$∆ H_{solution} = ∆ H_{hydration} (exothermic) + ∆ H_{latticeenthalpy} (endothermic) For Nacl dissolved in H_{2} O ∆ H_{hydrationethalpy} (- 784 kJ) \approx ∆ H_{latticeenthalpy} (+ 788 kJ)$
$∴ ∆ H_{solution} = + 4 kJ = + 1 k cal$
$∆ H_{solution}$ is almost negligible.(almost zero)
$∴$ solubility of NaCl in water almost remains constant with change in temperature

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