1
IAT (IISER) 2023
MCQ (Single Correct Answer)
+4
-1
In two solutions $X$ (hexane and benzene) and $Y$ (water and HCl ), what types of deviations from Raoult's law are observed?
A
Positive deviation and no deviation (ideal behaviour), respectively.
B
Negative deviation and positive deviation, respectively.
C
Positive deviation and negative deviation, respectively
D
No deviation (ideal behaviour) and negative deviation, respectively.
2
IAT (IISER) 2022
MCQ (Single Correct Answer)
+4
-1

2 g of naphthoic acid (molecular weight $=172 \mathrm{~g} \mathrm{~mol}^{-} 1$ ) dissolved in 20 mL of benzene shows a freezing point depression of 2 K . For benzene, the freezing point depression constant, $K_f=5$ $\mathrm{K} \mathrm{kg} \mathrm{mol}{ }^{-1}$ and the density is $0.88 \mathrm{~g} \mathrm{~mL}^{-1}$. What is the magnitude of the van't Hoff factor?

A
0.605
B
605.0
C
0.688
D
688.0
IAT (IISER) Subjects
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