Question

Which of the following statements is/are correct?

• A. The freezing point of water is depressed by the addition of glucose
• B. The degree of dissociation of a weak electrolyte decrease as its concentration decreases
• C. Energy is released when a substance dissolves in water provided that the hydration energy of the substance is more than its lattice energy
• D. If two liquids that form an ideal solution are mixed, the change in entropy is positive

Answer 1

Answer: (A), (C), (D)

a. There will be a depression in the freezing point by the addition of glucose in water
b. $\alpha$ increases as concentration decreases
c. $\Delta_{\text {sol }} H=\Delta_{\text {latice }} H+\Delta_{\text {hyd }} H$
(-ve) (-ve)
d. Mixing of solution is always accompained by an increase in entropy (randomness)