JEE-ADVANCED SERIES Chemistry
Solutions
21 previous year questions.
Volume: 21 Ques
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1981 Chapter Questions 21 MCQs
01
PYQ 1981
medium
chemistry ID: jee-adva
An azeotropic solution of two liquids has boiling point lower than either of them when it
1
shows negative deviation from Raoult- law
2
shows no deviation from Raoult's law
3
shows positive deviation from Raoult- law
4
is saturated
02
PYQ 1986
easy
chemistry ID: jee-adva
A molal solution is one that contains one mole of a solute in
1
1000 g of the solvent
2
1 L of the solvent
3
1 L of the solution
4
22.4 L of the solution
03
PYQ 1987
easy
chemistry ID: jee-adva
When mercuric iodide is added to the aqueous solution of potassium iodide
1
freezing point is raised
2
freezing point is lowered
3
freezing point does not change
4
boiling point does not change
04
PYQ 1999
medium
chemistry ID: jee-adva
In the depression of freezing point experiment, it is found that the
1
vapour pressure of the solution is less than that of pure solvent
2
vapour pressure of the solution is more than that of pure solvent
3
only solute molecules solidify at the freezing point
4
only solvent molecules solidify at the freezing point
05
PYQ 2003
easy
chemistry ID: jee-adva
During depression of freezing point in a solution the following are in equilibrium
1
liquid solvent, solid solvent
2
liquid solvent, solid solute
3
liquid solute, solid solute
4
liquid solute, solid solvent
06
PYQ 2004
medium
chemistry ID: jee-adva
0.004 MNa is isotonic with 0.01 M glucose. Degree of dissociation of Na is
1
0.75
2
0.5
3
0.25
4
0.85
07
PYQ 2010
easy
chemistry ID: jee-adva
The species which by definition has zero standard molar enthalpy of formation at is
1
2
3
4
08
PYQ 2012
medium
chemistry ID: jee-adva
For a dilute solution containing 2.5 g of a non-volatile non-electrolyte solute in 100g of water, the elevation in boiling point at 1 atm pressure is 2 C. Assuming
concentration of solute is much lower than the concentration of solvent, the vapour pressure (mm of Hg) of the solution is (take
1
724
2
740
3
736
4
718
09
PYQ 2013
easy
chemistry ID: jee-adva
Benzene and naphthalene form an ideal solution at room temperature. For this process, the true statement(s) is (are)
1
is positive
2
is positive
3
4
10
PYQ 2017
medium
chemistry ID: jee-adva
For a solution formed by mixing liquids and , the vapour pressure of plotted against the mole fraction of in solution is shown in the following figure. Here and represent mole fractions of and , respectively, in the solution. The correct statement applicable to this system is (are)
1
The point represents vapour pressure of pure liquid and Raoult's law is obeyed when
2
Attractive intermolecular interactions between in pure liquid and in pure liquid are stronger than those between when mixed in solution.
3
The point represents vapour pressure of pure liquid and Raoult's law is obeyed when .
4
The point represents vapour pressure of pure liquid and Raoult's law is obeyed from to
11
PYQ 2020
medium
chemistry ID: jee-adva
Liquid and form ideal solution for all compositions of and at . Two such solutions with and mole fractions of have the total vapour pressures of and bar, respectively. What is the vapour pressure of pure liquid in bar?
12
PYQ 2020
medium
chemistry ID: jee-adva
A colorless aqueous solution contains nitrates of two metals, and . When it was added to an aqueous solution of , a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue and a solution . The residue was soluble in aq and also in excess sodium thiosulfate. The hot solution gave a yellow precipitate with . The metals and , respectively, are
1
and
2
and
3
and
4
and
13
PYQ 2020
medium
chemistry ID: jee-adva
of oxalic acid solution taken in a conical flask is titrated against from a burette using phenolphthalein indicator. The volume of required for the appearance of permanent faint pink color is tabulated below for five experiments. What is the concentration, in molarity, of the solution?
Exp. No. | Vol. of NaOH (mL) |
|---|---|
1 | 12.5 |
2 | 10.5 |
3 | 9.0 |
4 | 9.0 |
5 | 9.0 |
14
PYQ 2021
medium
chemistry ID: jee-adva
The boiling point of water in a molal silver nitrate solution (solution ) is To this solution , an equal volume of molal aqueous barium chloride solution is added to make a new solution The difference in the boiling points of water in the two solutions and is (Assume: Densities of the solutions and are the same as that of water and the soluble salts dissociate completely Use: Molal elevation constant (Ebullioscopic Constant), ; Boiling point of pure water as )
The value of is ______
The value of is ______
15
PYQ 2021
medium
chemistry ID: jee-adva
The correct statement(s) related to colloids is(are)
1
The process of precipitating colloidal sol by an electrolyte is called peptization.
2
Colloidal solution freezes at higher temperature than the true solution at the same concentration.
3
Surfactants form micelle above critical micelle concentration (CMC). CMC depends on temperature.
4
Micelles are macromolecular colloids.
16
PYQ 2021
easy
chemistry ID: jee-adva
At 298 K, the limiting molar conductivity of a weak monobasic acid is 4 Γ 102 S cm2 molβ1. At 298 K, for an aqueous solution of the acid, the degree of dissociation is a and the molar conductivity is y Γ 102 S cm2 molβ1. At 298 K, upon 20 times dilution with water, the molar conductivity of the solution becomes 3y Γ 102 S cm2 molβ1.
17
PYQ 2021
easy
chemistry ID: jee-adva
The boiling point of water in a molal silver nitrate solution (solution ) is . To this solution , an equal volume of molal aqueous barium chloride solution is added to make a new solution . The difference in the boiling points of water in the two solutions and is
(Assume: Densities of the solutions and are the same as that of water and the soluble salts dissociate completely
Use: Molal elevation constant (Ebullioscopic Constant), ; Boiling point of pure water as )
(Assume: Densities of the solutions and are the same as that of water and the soluble salts dissociate completely
Use: Molal elevation constant (Ebullioscopic Constant), ; Boiling point of pure water as )
18
PYQ 2022
hard
chemistry ID: jee-adva
Concentration of and in a solution is and , respectively. Molar solubility of in the same solution is (expressed in scientific notation). The value of is ________. [Given: Solubility product of For is very large and
19
PYQ 2023
medium
chemistry ID: jee-adva
For He+, a transition takes place from the orbit of radius 105.8 pm to the orbit of radius 26.45 pm. The wavelength (in nm) of the emitted photon during the transition is ___.
[Use: Bohr radius, a = 52.9 pm, Rydberg constant, π H = 2.2 Γ 10β18 J, Planckβs constant, h = 6.6 Γ 10β34 J s, Speed of light, c = 3 Γ 108 m sβ1]
[Use: Bohr radius, a = 52.9 pm, Rydberg constant, π H = 2.2 Γ 10β18 J, Planckβs constant, h = 6.6 Γ 10β34 J s, Speed of light, c = 3 Γ 108 m sβ1]
20
PYQ 2023
easy
chemistry ID: jee-adva
For He+, a transition takes place from the orbit of radius 105.8 pm to the orbit of radius 26.45 pm. The wavelength (in nm) of the emitted photon during the transition is ___.
[Use: Bohr radius, a = 52.9 pm, Rydberg constant, π H = 2.2 Γ 10β18 J, Planckβs constant, h = 6.6 Γ 10β34 J s, Speed of light, c = 3 Γ 108 m sβ1]
[Use: Bohr radius, a = 52.9 pm, Rydberg constant, π H = 2.2 Γ 10β18 J, Planckβs constant, h = 6.6 Γ 10β34 J s, Speed of light, c = 3 Γ 108 m sβ1]
21
PYQ 2024
medium
chemistry ID: jee-adva
Vessel-1 contains w2 g of a non-volatile solute X dissolved in w1 g of water. Vessel-2 contains w2 g of another non-volatile solute Y dissolved in w1 g of water. Both the vessels are at the same temperature and pressure. The molar mass of X is 80% of that of Y. The van’t Hoff factor for X is 1.2 times of that of Y for their respective concentrations.
The elevation of boiling point for solution in Vessel-1 is _____ % of the solution in Vessel-2.
The elevation of boiling point for solution in Vessel-1 is _____ % of the solution in Vessel-2.