iCON Education - Ionic Equilibrium

2019 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2019 (Online) 9th January Morning Slot

20 mL of 0.1 M H₂SO₄ solution is added to 30 mL of of 0.2 M NH₄OH solution. The pH of the resultant mixture is : [pk_b of NH₄OH = 4.7].

A.

5.2

B.

9.0

C.

5.0

D.

9.4

2018 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2018 (Offline)

An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

A.

Base	Acid	End point
Weak	Strong	Colourless to pink

B.

Base	Acid	End point
Strong	Strong	Pinkish red to yellow

C.

Base	Acid	End point
Weak	Strong	Yellow to pinkish red

D.

Base	Acid	End point
Strong	Strong	Pink to colourless

2018 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2018 (Offline)

Which of the following salts is the most basic in aqueous solution?

A.

Pb(CH₃COO)₂

B.

Al(CN)₃

C.

CH₃COOK

D.

FeCl₃

2018 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2018 (Offline)

An aqueous solution contains an unknown concentration of Ba²⁺. When 50 mL of a 1 M solution of Na₂SO₄ is added, BaSO₄ just begins to precipitate. The final volume is 500 mL. The solubility product of BaSO₄ is 1 $\times$ 10^–10. What is the original concentration of Ba²⁺?

A.

1.0 $\times$ 10^–10 M

B.

5 $\times$ 10^–9 M

C.

2 $\times$ 10^–9 M

D.

1.1 $\times$ 10^–9 M

2018 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2018 (Offline)

Which of the following are Lewis acids?

A.

BCl₃ and AlCl₃

B.

PH₃ and BCl₃

C.

AlCl₃ and SiCl₄

D.

PH₃ and SiCl₄

2018 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2018 (Offline)

An aqueous solution contains 0.10 M H₂S and 0.20 M HCl. If the equilibrium constants for the formation of HS^– from H₂S is 1.0 $\times$ 10^–7 and that of S^2- from HS^– ions is 1.2 $\times$ 10^–13 then the concentration of S^2- ions in aqueous solution is :

A.

5 $\times$ 10^–19

B.

5 $\times$ 10^–8

C.

3 $\times$ 10^–20

D.

6 $\times$ 10^–21

2018 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2018 (Online) 15th April Evening Slot

Following four solutions are prepared by mixing different volumes of NaOH and HCl of different concentrations, pH of which one of them will be equal to 1 ?

A.

100 mL ${M \over {10}}$ HCl + 100 mL ${M \over {10}}$ NaOH

B.

75 mL ${M \over {5}}$ HCl + 25 mL ${M \over {5}}$ NaOH

C.

60 mL ${M \over {10}}$ HCl + 40 mL ${M \over {10}}$ NaOH

D.

55 mL ${M \over {10}}$ HCl + 45 mL ${M \over {10}}$ NaOH

2018 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2018 (Online) 15th April Morning Slot

The minimum volume of water required to dissolve 0.1 g lead (II) chloride to get a saturated solution (K_sp of PbCl₂ = 3.2 $ \times $ 10^-8 atomic mass of Pb = 207 u ) is :

A.

0.36 L

B.

17.98 L

C.

0.18 L

D.

1.798 L

Correct Answer: C

Explanation:

Given,

K_sp of PbCl₂ = 3.2 $ \times $10^$-$8

	PbCl₂ $\rightleftharpoons$	Pb²⁺	2Cl
Initially	1	0	0
At equilibrium	1-s	s	2s

K_sp = [s] [2s]²

$\therefore\,\,\,\,$ K_sp = 4s³

$\therefore\,\,\,\,$ 4s³ = 3.2 $ \times $ 10^$-$8

$ \Rightarrow $ $\,\,\,\,$ s³ = 8 $ \times $ 10^$-$9

$ \Rightarrow $ $\,\,\,\,$ s = 2 $ \times $ 10 ^$-$3 M

Solubility = ${{no.\,\,of\,moles\,\,of\,\,pbc{l_2}\,} \over {volume\,(in\,\,litre)}}$

$\therefore\,\,\,\,$ 2 $ \times $ 10^$-$3 = ${{0.1} \over {278}}$ $ \times $ ${1 \over V}$

$ \Rightarrow $ $\,\,\,\,$ V = ${{0.1} \over {278}}$ $ \times $ ${{{{10}^3}} \over 2}$ = 0.18 L

2018 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2018 (Online) 15th April Morning Slot

Which of the following is a Lewis acid?

A.

PH₃

B.

B(CH₃)₃

C.

NaH

D.

NF₃

2017 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2017 (Online) 9th April Morning Slot

50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pK_b of ammonia solution is 4.75, the pH of the mixture will be :

A.

3.75

B.

4.75

C.

8.25

D.

9.25

2017 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2017 (Online) 8th April Morning Slot

Additin of sodium hydroxide solution to a weak acid (HA)results in a buffer of pH 6. If ionition constant of HA is 10^$-$5, the ratio of salt to acid concentration in the buffer solution will be :

A.

4 : 5

B.

1 : 10

C.

10 : 1

D.

5 : 4

2017 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2017 (Offline)

pK_a of a weak acid (HA) and pK_b of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :

A.

6.9

B.

7.0

C.

1.0

D.

7.2

2013 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 JEE Main 2013 (Offline)

How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?

A.

0.1 L

B.

0.9 L

C.

2.0 L

D.

9.0 L

2012 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2012

The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, K_a of this acid is :

A.

3 $\times$ 10^–1

B.

1 $\times$ 10^–3

C.

1 $\times$ 10^–5

D.

1 $\times$ 10^–7

2010 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2010

Three reactions involving $H_2PO_4^−$ are given below :

(i) H₃PO₄ + H₂O $\to$ H₃O⁺ + $H_2PO_4^−$

(ii) $H_2PO_4^−$ + H₂O $\to$ $HPO_4^{2−}$ + H₃O⁺

(iii) $H_2PO_4^−$ + OH^- $\to$H₃PO₄ + O^2-

In which of the above does $H_2PO_4^−$ act as an acid?

A.

(ii) only

B.

(i) and (ii)

C.

(iii) only

D.

(i) only

Correct Answer: A

Explanation:

To determine in which reactions $ H_2PO_4^- $ acts as an acid, we need to understand the Bronsted-Lowry concept of acids and bases. According to this concept, an acid is a substance that donates a proton (H⁺) to another substance, while a base is a substance that accepts a proton.

Let's analyze each reaction :

1. $ H_3PO_4 + H_2O \to H_3O^+ + H_2PO_4^- $
- In this reaction, $ H_3PO_4 $ is donating a proton to $ H_2O $, forming $ H_3O^+ $ and $ H_2PO_4^- $.
- $ H_2PO_4^- $ is the product of this reaction and is not acting as an acid here.

2. $ H_2PO_4^- + H_2O \to HPO_4^{2−} + H_3O^+ $
- In this reaction, $ H_2PO_4^- $ donates a proton to $ H_2O $, resulting in $ HPO_4^{2−} $ and $ H_3O^+ $.
- $ H_2PO_4^- $ is acting as an acid in this reaction.
3. $ H_2PO_4^- + OH^- \to H_3PO_4 + O^{2-} $
- This reaction is not correctly balanced and does not follow standard chemical reaction rules. The product $ O^{2-} $ is highly unlikely in aqueous solutions due to its reactivity.
- A more correct reaction would be $ H_2PO_4^- + OH^- \to HPO_4^{2−} + H_2O $. In this corrected reaction, $ H_2PO_4^- $ is donating a proton to $ OH^- $, which makes it an acid.

Given the information, the correct option is :

Option A : (ii) only

This is because in reaction (ii), $ H_2PO_4^- $ is clearly acting as an acid by donating a proton to water. In reaction (i), $ H_2PO_4^- $ is not acting as an acid but rather is formed as a product. Reaction (iii) as written is chemically incorrect, but even in a corrected form, it would show $ H_2PO_4^- $ acting as an acid.

2010 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2010

Solubility product of silver bromide is 5.0 $\times$ 10^–13. The quantity of potassium bromide (molar mass taken as 120g of mol^–1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is :

A.

1.2 $\times$ 10^–10 g

B.

1.2 $\times$ 10^–9 g

C.

6.2 $\times$ 10^–5 g

D.

5.0 $\times$ 10^–8 g

2010 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2010

At 25°C, the solubility product of Mg(OH)₂ is 1.0 $\times$ 10^–11. At which pH, will Mg²⁺ ions start precipitating in the form of Mg(OH)₂ from a solution of 0.001 M Mg²⁺ ions?

A.

9

B.

10

C.

11

D.

8

2009 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2009

Solid Ba(NO₃)₂ is gradually dissolved in a 1.0 $\times$ 10^-4 M Na₂CO₃ solution. At what concentration of Ba²⁺ will a precipitate begin to form ?
(K_sp for BaCO₃ = 5.1 $\times$ 10⁻⁹ )

A.

5.1 $\times$ 10^-5 M

B.

8.1 $\times$ 10^-8 M

C.

8.1 $\times$ 10^-7 M

D.

4.1 $\times$ 10^-5 M

2008 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2008

The pK_a of a weak acid, HA, is 4.80. The pK_b of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be

A.

9.58

B.

4.79

C.

7.01

D.

9.22

2008 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2008

Four species are listed below
i. $HCO_3^−$
ii. $H_3O^+$
iii. $HSO_4^−$
iv. $HSO_3F$
Which one of the following is the correct sequence of their acid strength?

A.

iv < ii < iii < I

B.

ii < iii < i < iv

C.

i < iii < ii < iv

D.

iii < i < iv < ii

2007 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2007

The pK_a of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is :

A.

7.0

B.

4.5

C.

2.5

D.

9.5

2007 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2007

The first and second dissociation constants of an acid H₂A are 1.0 $\times$ 10⁻⁵ and 5.0 $\times$ 10⁻¹⁰ respectively. The overall dissociation constant of the acid will be :

A.

5.0 $\times$ 10⁻⁵

B.

5.0 $\times$ 10¹⁵

C.

5.0 $\times$ 10⁻¹⁵

D.

5.0 $\times$ 10⁵

2007 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2007

In a sautrated solution of the sparingly soluble strong electrolyte AgIO₃ (Molecular mass = 283) the equilibrium which sets in is
AgIO_3(s) $\leftrightharpoons$ Ag⁺(aq) + $IO_3^-$
If the solubility product constant K_sp of AgIO₃ at a given temperature is 1.0 $\times$10⁻⁸, what is the mass of AgIO₃ contained in 100 ml of its saturated solution?

A.

28.3 × 10⁻² g

B.

2.83 × 10⁻³ g

C.

1.0 × 10⁻⁷ g

D.

1.0 × 10⁻⁴ g

2005 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2005

What is the conjugate base of OH^-?

A.

O₂

B.

H₂O

C.

O^-

D.

O^-2

2005 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2005

The solubility product of a salt having general formula MX₂, in water is: 4 $\times$ 10^-12 . The concentration of M²⁺ ions in the aqueous solution of the salt is :

A.

2.0 $\times$ 10^-6 M

B.

4.0 $\times$ 10^-10 M

C.

1.0 $\times$ 10^-4 M

D.

1.6 $\times$ 10^-4 M

2005 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2005

Hydrogen ion concentration in mol / L in a solution of pH = 5.4 will be :

A.

3.98 $\times$ 10^-6

B.

3.68 $\times$ 10^-6

C.

3.88 $\times$ 10⁶

D.

3.98 $\times$ 10⁸

2004 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2004

The molar solubility (in ol L^-1) of a sparingly soluble salt MX₄ is "s". The corresponding solubility product is K_sp. 's' is given in term of K_sp by the relation :

A.

s = (256 K_sp)^1/5

B.

s = (128 K_sp)^1/4

C.

s = ( K_sp / 128)^1/4

D.

s = (K_sp / 256)^1/5

2004 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2004

The conjugate base of H₂PO₄^- is :

A.

$PO_4^{3-}$

B.

$HPO_4^{2-}$

C.

H₃PO₄

D.

P₂O₅

2003 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2003

Which one of the following statements is not true?

A.

pH + pOH = 14 for all aqueous solutions

B.

The pH of 1 $\times$ 10^-8 M HCl is 8

C.

96,500 coulombs of electricity when passed through a CuSO₄ solution deposits 1 gram equivalent of copper at the cathode

D.

The conjugate base of $H_2PO_4^-$ is $HPO_4^{2-}$

2003 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2003

The solubility in water of a sparingly soluble salt AB₂ is 1.0 $\times$ 10^-5 mol L^-1. Its solubility product number will be :

A.

4 $\times$ 10^-10

B.

1 $\times$ 10^-15

C.

1 $\times$ 10^-10

D.

4 $\times$ 10^-15

2003 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2003

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value :

A.

slightly higher than that when the thunderstorm is not there

B.

uninfluenced by occurence of thunderstorm

C.

which depends on the amount of dust in air

D.

slightly lower than that of rain water without thunderstorm

2002 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2002

Species acting as both Bronsted acid and base is :

A.

(HSO₄)^-1

B.

Na₂CO₃

C.

NH₃

D.

OH^-1

2002 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2002

Let the solubility of an aqueous solution of Mg(OH)₂ be x then its K_sp is :

A.

4x³

B.

108x⁵

C.

27x⁴

D.

9x

2002 JEE Mains MCQ

iCON Education HYD, 79930 92826, 73309 72826 AIEEE 2002

1 M NaCL and 1 M HCL are present in an aqueous solution. The solution is

A.

not a buffer solution with pH < 7

B.

not a buffer solution with pH > 7

C.

a buffer solution with pH < 7

D.

a buffer solution with pH > 7

Chemistry Chapters

Ionic Equilibrium

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