Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 7 - Ionic Equilibrium>DPP 7.5>Q 3

HARD

JEE Main

IMPORTANT

Earn 100

A weak acid $HA$ after treatment with $12 mL$ of $0.1 M$ strong base $BOH$ has a $pH$ of $5$ . At the end point, the volume of same base required is $26.6 mL$ . Calculate $K_{a}$ of acid.

Important Questions on Ionic Equilibrium

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 7 - Ionic Equilibrium>DPP 7.5>Q 4

The solubility of

Pb (OH)_{2}

in water is

HA

. Calculate the solubility of

Pb (OH)_{2}

in a buffer solution of

pH = 8

.

MEDIUM

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 7 - Ionic Equilibrium>DPP 7.5>Q 5

The

pH

of a buffer is

4.745

. When

0.01

mole of

NaOH

is added to

1

litre of it, the

pH

changes to

4.832

, calculate its buffer capacity.

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 7 - Ionic Equilibrium>DPP 7.5>Q 6

What is the

pH

of the solution when

0.2

mole of hydrochloric acid is added to one litre of a solution containing

1 M

acetic acid and acetate ion? Assume that the total volume is one litre.

(K_{a} for {CH}_{3} COOH = 1.8 \times 10^{- 5})

MEDIUM

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 7 - Ionic Equilibrium>DPP 7.5>Q 7

Which of the following can be used as a buffer solution?

MEDIUM

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 7 - Ionic Equilibrium>DPP 7.5>Q 8

On diluting a buffer solution, its

pH

:

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 7 - Ionic Equilibrium>DPP 7.5>Q 9

0 .1 mol

of

{CH}_{3} {NH}_{2} (K_{b}^{} = 6 \times 10^{- 4})

is added to

0.08

mol

of

HCl

and the solution is diluted to

1 L .

The hydrogen ion concentration in the solution is:

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 7 - Ionic Equilibrium>DPP 7.5>Q 10

A buffer of

pH = 8.5

is required,

{pK}_{a}^{} ({NH}_{4}^{+}) = 9 .2

, the amount of

{({NH}_{4})}_{2} {SO}_{4}

to be added in

500 mL

of

0.1 M {NH}_{4} OH

would be:

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 7 - Ionic Equilibrium>DPP 7.5>Q 11

The $pH$ of the resulting solution of $20 mL$ of $0.1 M H_{3} {PO}_{4}$ and $20 mL$ of $0.1 M {Na}_{3} {PO}_{4}$ is: