Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 77

MEDIUM

JEE Main/Advance

IMPORTANT

Earn 100

The pH of which salt solution is independent of its concentration
$(1)$ $(C H_{3} C O O) C_{5} H_{5} N H$
$(2)$ $N a H_{2} P O_{4}$
$(3)$ $N a_{2} H P O_{4}$
$(4)$ $N H_{4} C N$

50% studentsanswered this correctly

Important Questions on Equilibrium

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 78

In a solution obtained by mixing

100 mL

of

0.25 M

Triethylamine

(K_{b} = 6.4 \times 10^{- 5}) & 400 mL

of

\frac{M}{18} {NH}_{4}

OH (K_{b} = 1.8 \times 10^{- 5})

:

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 79

Ratio of

[{HA}^{2 -}]

in

1 L

of

0.1 M H_{3} A

solution

(K_{a_{1}} = 10^{- 5}; K_{a_{2}} = 10^{- 8} & K_{a_{3}} = 10^{- 11}) &

upon addition of

0.1 mole

HCl

to it will be :

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 82

Calculate

[H^{+}]

in a

0.2 M

solution of dichloroacetic acid

(K_{a} = 5 \times 10^{- 2})

that also contains

0.05 M H_{2} {SO}_{4}

. Report your answer after multiplying it by

400

.

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 86

The

pH

of a solution resulting from the addition of

12.5 ml

of

0.1 M HCl

to

50 ml

of a solution containing

0.15 M {CH}_{3} COOH & 0.2 M {CH}_{3} COONa

will be (Given :

{pK}_{a}

of

{CH}_{3} COOH = 4.74

)

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 87

What

%

of the carbon in the

H_{2} {CO}_{3} - {HCO}_{3}^{-}

buffer should be in the form of

{HCO}_{3}^{-}

so as to have a neutral solution?

(K_{a} = 4 \times 10^{- 7})

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 88

Buffer capacity of a buffer solution is

x

, the volume of

1 M NaOH

added to

100 mL

of this solution if change the

pH

by

1

is:

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 90

100 m L

of

0.02 M

benzoic acid

({pK}_{a} = 4.2)

is titrated using

0.02 M

N a O H

.

pH

after

50 m L

and

100 m L

of

N a O H

have been added are

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 91

Which of the following solutions have different $pH$ ?

$(i)$ $100 mL$ of $0.2 M HCl + 100 mL$ of $0.4 M {NH}_{3}$

$(ii)$ $50 mL$ of $0.1 M HCl + 50 mL$ of $0.2 M {NH}_{3}$

$(iii)$ $100 mL$ of $0.3 M HCl + 100 mL$ of $0.6 M {NH}_{3}$