Pradeep's Chemistry Vol 1>Chapter 9 - Ionic Equilibrium in Solution>Competition Focus>Q 108

MEDIUM

11th CBSE

IMPORTANT

Earn 100

$MY and {NY}_{3}$ , two nearly insoluble salts have the same $K_{sp}$ value of $6.2 \times 10^{- 13}$ at room temperature. Which statement would be true in regard to $MY and {NY}_{3}$ ?

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Important Questions on Ionic Equilibrium in Solution

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 9 - Ionic Equilibrium in Solution>Competition Focus>Q 109

The solubility of ${BaSO}_{4}$ in water is $2.42 \times 10^{- 3} g L^{- 1}$ at $298 K$ . The value of its solubility product $(K_{sp})$ will be

(Given molar mass of ${BaSO}_{4}$ = $233 g L^{- 1}$ )

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 9 - Ionic Equilibrium in Solution>Competition Focus>Q 110

An aqueous solution contains an unknown concentration of

{Ba}^{2 +}

. When

50 mL

of

1 M

solution of

{Na}_{2} {SO}_{4}

is added,

{BaSO}_{4}

just begins to precipitate. The final volume is

500 mL

. The solubility product of

{BaSO}_{4}

is

1 \times 10^{- 10}

. What is the original concentration of

{Ba}^{2 +}

?

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 9 - Ionic Equilibrium in Solution>Competition Focus>Q 111

Which one of the following pairs of solutions is not an acidic buffer ?

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 9 - Ionic Equilibrium in Solution>Competition Focus>Q 112

How much sodium acetate should be added to

0.1 M

solution of

{CH}_{3} COOH

to give a solution of pH

5.5 ({pK}_{a}

of

{CH}_{3} COOH

=

4.5

).

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 9 - Ionic Equilibrium in Solution>Competition Focus>Q 113

0.1

mole of

{CH}_{3} {NH}_{2}

(K_{b} = 5 \times 10^{- 4})

is mixed with

0.08

mole of

HCI

and the solution diluted to one litre. The

H^{+}

ion concentration in the solution will be

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 9 - Ionic Equilibrium in Solution>Competition Focus>Q 114

In what volume ratio

{NH}_{4} Cl and {NH}_{4} OH

solutions (each

1 M

) should be mixed to get a buffer solution of pH

9.80

? (

{pK}_{b}

of

{NH}_{4} OH

=

4.74

)

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 9 - Ionic Equilibrium in Solution>Competition Focus>Q 115

The ratio of volumes of

{CH}_{3} COOH, 0.1 N to {CH}_{3} COONa, 0.1 N

required to prepare a buffer solution of

pH

5.74

is (given :

{pK}_{a}

of

{CH}_{3} COOH

is

4.74

)

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 9 - Ionic Equilibrium in Solution>Competition Focus>Q 116

Buffer index of a buffer of

0.1 M

{NH}_{4} OH

and

0.1 M

{NH}_{4} Cl

is (

{pK}_{b}

for

{NH}_{4} OH

=

4.74

)