Question 1: Palette 1/13

JEE Advanced 2017 MCQ

Pure water freezes at $273$ $K$ and $1$ bar. The addition of $34.5$ $g$ of ethanol to $500$ $g$ of water changes the freezing point of the solution. Use the freezing point depression constant of water as $2$ kg $mo{l^{ - 1}}.$ The figures shown below represent plots of vapor pressure $(V.P.)$ versus temperature $(T).$ [molecular weight of ethanol is $46$ $g$ $mo{l^{ - 1}}.$ ] Among the following, the option representing change in the freezing point is

A

B

C

D

Question 2: Palette 2/13

JEE Advanced 2017 MSQ

For a solution formed by mixing liquids $L$ and $M,$ the vapor pressure of $L$ plotted against the mole fraction of $M$ in solution is shown in the following figure. Here ${X_L}$ and ${X_M}$ represent mole fractions of $L$ and $M,$ respectively, in the solution. The correct statement(s) applicable to this system is (are)

A

The point $Z$ represents vapor pressure of pure liquid $M$ and Raoult's law is obeyed from ${X_L} = 0$ to ${X_L} = 1$

B

The point $Z$ represents vapor pressure of pure liquid $L$ and Raoult's law is obeyed when ${X_L} \to 1$

C

The point $Z$ represents vapor pressure of pure liquid $M$ and Raoult's law is obeyed when ${X_L} \to 0$

D

Attractive intermolecular interactions between $L$-$L$ in pure liquid $L$ and $M$-$M$ in pure liquid $M$ are stronger than those between $L-M$ when mixed in solution.

Question 3: Palette 3/13

JEE Advanced 2016 MCQ

The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of KCl, CH₃OH and CH₃(CH₂)₁₁ OSO$_3^ - $ Na⁺ at room temperature. The correct assignment of the sketches is

A

I : KCl

II : CH₃OH

III : CH₃(CH₂)₁₁ OSO$_3^ - $ Na⁺

B

I. CH₃(CH₂)₁₁ OSO$_3^ - $ Na⁺

II. CH₃OH

III. KCl

C

I. KCl

II. CH₃(CH₂)₁₁ OSO$_3^ - $ Na⁺

III. CH₃OH

D

I. CH₃OH

II. KCl

III. CH₃(CH₂)₁₁ OSO$_3^ - $ Na⁺

Question 4: Palette 4/13

JEE Advanced 2016 MSQ

Mixture (s) showing positive deviation from Raoult’s law at 35^oC is (are)

A

carbon tetrachloride + methanol

B

carbon disulphide + acetone

C

benzene + toluene

D

phenol + aniline

Question 5: Palette 5/13

JEE Advanced 2012 MCQ

For a dilute solution containing 2.5 g of a non-volatile non-electrolyte solute in 100 g of water. the elevation in boiling point at 1 atm pressure is 2^oC. Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (mm of Hg) of the solution is (take K_b = 0.76 K Kg mol^-1)

A

724

B

780

C

736

D

718

Question 6: Palette 6/13

JEE Advanced 2011 MCQ

The freezing point (in ^oC) of a solution containing 0.1 g of K₃[Fe(CN)₆] (Mol. wt. 329) in 100 g of water (K_f = 1.86 K kg mol^-1) is

A

-2.3 $\times$ 10^-2

B

-5.7 $\times$ 10^-2

C

-5.7 $\times$ 10^-3

D

-1.2 $\times$ 10^-2

Question 7: Palette 7/13

JEE Advanced 2009 MCQ

The Henry's law constant for the solubility of N$_2$ gas in water at 298 K is 1.0 $\times$ 10$^5$ atm. The mole fraction of N$_2$ in air is 0.8. The number of moles of N$_2$ from air dissolved in 10 moles of water at 298 K and 5 atm pressure is

A

4.0 $\times$ 10$^{-4}$

B

4.0 $\times$ 10$^{-5}$

C

5.0 $\times$ 10$^{-4}$

D

4.0 $\times$ 10$^{-6}$

Question 8: Palette 8/13

JEE Advanced 2008 MCQ

The freezing point of the solution M is :

A

268.7 K

B

268.5 K

C

234.2 K

D

150.9 K

Question 9: Palette 9/13

JEE Advanced 2008 MCQ

The vapour pressure of the solution M is :

A

39.3 mm Hg

B

36.0 mm Hg

C

29.5 mm Hg

D

28.8 mm Hg

Question 10: Palette 10/13

JEE Advanced 2008 MCQ

Water is added to the solution M such that the fraction of water in the solution becomes 0.9 mole. The boiling point of this solution is:

A

380.4 K

B

376.2 K

C

375.5 K

D

354.7 K

Question 11: Palette 11/13

JEE Advanced 2007 MCQ

When 20 g of naphthoic acid (C$_{11}$H$_{8}$O$_{2}$) is dissolved in 50 g of benzene in 50 g of benzene (K$_f$ = 1.72 K kg mol$^{-1}$), a freezing point depression of 2 K is observed. The van't Hoff factor (i) is :

A

0.5

B

1

C

2

D

3

Question 12: Palette 12/13

JEE Advanced 2005 MCQ

The elevation in boiling point of a solution of 13.44 g of CuCl₂ in 1kg of water using the following information will be (Molecular weight of CuCl₂ = 134.4 and K_b = 0.52 K molal^-1)

A

0.16

B

0.05

C

0.1

D

0.2

Question 13: Palette 13/13

JEE Advanced 1990 MCQ

The freezing point of equimolal aqueous solutions will be highest for

A

C₆H₅NH₃Cl (aniline hydrochloride)

B

Ca(NO₃)₂

C

La(NO₃)₃

D

C₆H₁₂O₆ (glucose)