JEE-MAIN SERIES Chemistry
Ionic Equilibrium In Solution
37 previous year questions.
Volume: 37 Ques
Yield: High
High-Yield Trend
15
2026 7
2024 3
2023 5
2022 7
2021 Chapter Questions 37 MCQs
01
PYQ 2021
medium
chemistry ID: jee-main
Given below are two statements :
Statement I : In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II : For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator.
In the light of the above statements, choose the most appropriate answer from the options given below :
Statement I : In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II : For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator.
In the light of the above statements, choose the most appropriate answer from the options given below :
1
Both Statement I and Statement II are true
2
Both Statement I and Statement II are false
3
Statement I is true but Statement II is false
4
Statement I is false but Statement II is true
02
PYQ 2021
medium
chemistry ID: jee-main
The concentration in a mixture of 5.0 mL of 0.0504 M and 2 mL of 0.0210 M solution is M. The value of is _________. (Nearest integer)
[Given and ]
[Given and ]
03
PYQ 2021
medium
chemistry ID: jee-main
The pH of a solution obtained by mixing 50 mL of 1 M HCl and 30 mL of 1 M NaOH is . The value of is ________. (Nearest integer) [log 2.5 = 0.3979]
04
PYQ 2021
medium
chemistry ID: jee-main
The solubility of AgCN in a buffer solution of pH=3 is x. The value of x is : [Assume : No cyano complex is formed ; and ]
1
2
3
4
05
PYQ 2021
medium
chemistry ID: jee-main
The solubility of CdSO₄ in water is 8.0 × 10^{-4} mol L^{-1}. Its solubility in 0.01 M H₂SO₄ solution is ________ × 10^{-6} mol L^{-1}. (Round off to the Nearest Integer). (Assume that solubility is much less than 0.01 M)
06
PYQ 2021
medium
chemistry ID: jee-main
The solubility product of PbI2 is . The solubility of lead iodide in 0.1 molar solution of lead nitrate is mol/L. The value of is __________. (Rounded off to the nearest integer) [Given ]
07
PYQ 2021
medium
chemistry ID: jee-main
In order to prepare a buffer solution of pH 5.74, sodium acetate is added to acetic acid. If the concentration of acetic acid in the buffer is 1.0 M, the concentration of sodium acetate in the buffer is __________ M. (Round off to the Nearest Integer). [Given : pKa (acetic acid) = 4.74]
08
PYQ 2022
medium
chemistry ID: jee-main
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : is sparingly soluble in water.
Reason R : The ionic radius of ion is smallest among its group members, hence has least hydration enthalpy.
In the light of the above statements, choose the most appropriate answer from the options given below.
Assertion A : is sparingly soluble in water.
Reason R : The ionic radius of ion is smallest among its group members, hence has least hydration enthalpy.
In the light of the above statements, choose the most appropriate answer from the options given below.
1
Both A and R are true and R is the correct explanation of A
2
Both A and R are true but R is NOT the correct explanation of A
3
A is true but R is false.
4
A is false but R is true.
09
PYQ 2022
easy
chemistry ID: jee-main
Ka1, Ka2 and Ka3 are the respective ionization constants for the following reactions (a),(b), and (c).
(a) H2C2O4⇌H++HC2O4−
(b) HC2O4−⇌H++HC2O42−
(c) H2C2O4⇌2H++C2O42−
The relationship between Ka1,Ka2 and Ka3 is given as
(a) H2C2O4⇌H++HC2O4−
(b) HC2O4−⇌H++HC2O42−
(c) H2C2O4⇌2H++C2O42−
The relationship between Ka1,Ka2 and Ka3 is given as
10
PYQ 2022
medium
chemistry ID: jee-main
The correct order of increasing ionic radii is
1
2
3
4
11
PYQ 2022
medium
chemistry ID: jee-main
Ionic radii of cation A+ and anion B– are 102 and 181 pm, respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for B–. A+ is present in all octahedral voids. The edge length of the unit cell of the crystal AB is _____pm. (Nearest integer)
12
PYQ 2022
medium
chemistry ID: jee-main
pH value of 0.001 M NaOH solution is _______.
13
PYQ 2023
medium
chemistry ID: jee-main
and are the respective ionization constants for the following reactions (a), (b) and (c)
(a)
(b)
(c)
The relationship between and is given as
(a)
(b)
(c)
The relationship between and is given as
1
2
3
4
14
PYQ 2023
medium
chemistry ID: jee-main
Which one of the following sets of ions represents a collection of isoelectronic species ?
(Given : Atomic Number : )
(Given : Atomic Number : )
1
2
3
4
15
PYQ 2023
medium
chemistry ID: jee-main
25 mL of silver nitrate solution (1M) is added dropwise to 25 mL of potassium iodide (1.05 M) solution. The ions(s) present in very small quantity in the solution is/are:
1
NO₃⁻ only
2
Ag⁺ and I⁻ both
3
Ag⁺ only
4
I⁻ only
16
PYQ 2024
easy
chemistry ID: jee-main
Which of the following has the highest 3rd ionization energy?
1
Mn
2
V
3
Cr
4
Fe
17
PYQ 2024
medium
chemistry ID: jee-main
Which of the following elements has the highest 1st ionization energy ?
1
N
2
C
3
Si
4
Al
18
PYQ 2024
medium
chemistry ID: jee-main
Which of the following is least iconic
1
2
3
4
19
PYQ 2024
medium
chemistry ID: jee-main
Given below are two statements:
Statement I: On passing HCl through a saturated solution of BaCl , at room temperature white turbidity appears.
Statement II: When HCl gas is passed through a saturated solution of NaCl, sodium chloride is precipitated due to common ion effect.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement I: On passing HCl through a saturated solution of BaCl , at room temperature white turbidity appears.
Statement II: When HCl gas is passed through a saturated solution of NaCl, sodium chloride is precipitated due to common ion effect.
In the light of the above statements, choose the most appropriate answer from the options given below:
1
Statement I is correct but Statement II is incorrect
2
Both Statement I and Statement II are incorrect
3
Statement I is incorrect but Statement II is correct
4
Both Statement I and Statement II are correct
20
PYQ 2024
medium
chemistry ID: jee-main
21
PYQ 2024
medium
chemistry ID: jee-main
Solubility of calcium phosphate (molecular mass, ) in water is per 100 mL at . Its solubility product at will be approximately:
1
2
3
4
22
PYQ 2024
medium
chemistry ID: jee-main
The spin only magnetic moment of complex ion + is . The value of is
23
PYQ 2026
medium
chemistry ID: jee-main
CaCO (s) CaO(s) + CO (g),
C(s) + CO (g) 2CO(g),
If the partial pressure of CO at equilibrium is atm, then find the value of .
C(s) + CO (g) 2CO(g),
If the partial pressure of CO at equilibrium is atm, then find the value of .
24
PYQ 2026
medium
chemistry ID: jee-main
Calculate the equilibrium constant for the following equilibrium:
Given:
Given:
25
PYQ 2026
medium
chemistry ID: jee-main
20 ml of 0.2 M HA ( ) is titrated with 10 ml of 0.2 M NaOH solution. Calculate the initial and final value of pH of the solution. [Given ]
1
2, 3.3
2
1.65, 2
3
3.3, 2
4
2, 3.6
26
PYQ 2026
easy
chemistry ID: jee-main
K of Ag CrO = 32x
K of AgBr = 4y Then, the ratio of molarity (solubility) of (1) to (2) is:
1
2
3
4
27
PYQ 2026
medium
chemistry ID: jee-main
Find the concentration of at equilibrium in 0.1 M . Given and .
1
2
3
4
28
PYQ 2026
hard
chemistry ID: jee-main
Find the concentration of at equilibrium in
. Given:
1
2
3
4
29
PYQ 2026
easy
chemistry ID: jee-main
There is a weak base 'B' having of molarity 0.02M. When 0.02M HCl solution has been added, then pH of resultant buffer solution has been found to be 9. Take total volume of resultant buffer solution to be 100 ml. Find the value of 'x' & 'y', where 'x' is volume of HCl solution in ml & 'y' is volume of 'B' solution in ml. Given
1
x=14.29, y=85.71
2
x=15, y=85
3
x=20, y=80
4
x=40, y=60
30
PYQ 2026
medium
chemistry ID: jee-main
The first and second ionization constants of are and respectively. The concentration of in M solution is ____________ M. (Nearest Integer)
31
PYQ 2026
hard
chemistry ID: jee-main
Molar conductivity of a weak acid HQ of concentration 0.18 M was found to be of the molar conductivity of another weak acid HZ with concentration 0.02 M. If happened to be equal to , then the difference of the pKa values of the two weak acids (pKa(HQ) − pKa(HZ)) is ________ (Nearest integer).
(Given: degree of dissociation for both weak acids, : limiting molar conductivity of ions)
(Given: degree of dissociation for both weak acids, : limiting molar conductivity of ions)
32
PYQ 2026
medium
chemistry ID: jee-main
0.1 mole of is added in 1 liter of 0.1 HCl solution. Calculate the concentration of .
[Given and ]
[Given and ]
1
2
3
0.1 M
4
0.05 M
33
PYQ 2026
medium
chemistry ID: jee-main
Which of the following is a basic buffer?
1
2
3
4
34
PYQ 2026
medium
chemistry ID: jee-main
Calculate pH of 10 mM weak acid (HA) dissociated in water. Assume to be negligible. Given
1
2
2
4
3
3
4
5
35
PYQ 2026
medium
chemistry ID: jee-main
0.18 M HQ solution has molar conductivity times the molar conductivity of 0.02 M HZ solution. Find the value of pK (HQ) − pK (HZ).
[Given that is very less than 1]
[Given that is very less than 1]
36
PYQ 2026
medium
chemistry ID: jee-main
Volume ratio of decimolar and decimolar to give a solution of pH = 9.25 at is . Find . (Given: of )
37
PYQ 2026
medium
chemistry ID: jee-main
Volume ratio of decimolar and decimolar to give a solution of pH at is . Find . (Given: of )