MEDIUM

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Which combination of reactants best represents the amphoteric character of $Zn {(OH)}_{2}$ ?

${I. Zn(OH)}_{2} (s), H^{+} (aq)$

${II. Zn(OH)}_{2} (s), {OH}^{-} (aq)$

${III. Zn(OH)}_{2} (s), H_{2} O (l)$

${IV. Zn(OH)}_{2} (s), {NH}_{3} (aq)$

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Important Questions on Equilibrium

EASY

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

The

pH

of pure water at

80 ° C

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

The

pH

of an aqueous solution of

10^{- 8} MHCl

EASY

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

Which of the following equations give ionic product of water?

(i) ${NH}_{3 (aq)} + H_{2} O ⇆ {NH}_{4 (aq)}^{+} + {OH}_{(aq)}^{-}$

(ii) ${NH}_{4 (aq)}^{+} + H_{2} O ⇆ H_{3} O^{+} + {NH}_{3 (aq)}$

(iii) ${NH}_{2 (aq)}^{-} + H_{2} O ⇆ {NH}_{3 (aq)} + {OH}^{-}$

(iv) ${NH}_{3 (aq)} + {OH}_{(aq)}^{-} ⇆ {NH}_{2 (aq)}^{-} + H_{2} O$

HARD

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

For the following Assertion and Reason, the correct option is:
Assertion: The

p H

of water increases with increase in temperature.
Reason: The dissociation of water into

H^{+}

and

O H^{-}

is an exothermic reaction.

HARD

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

298 K,

the ratio of dissociated water to that of undissociated water is [Assume pure water]

EASY

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

The

pH

of pure water at

90 {}^{\circ}C

will be

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

How many litres of water must be added to

1

litre of aqueous solution of

HCl

with a pH of

1

to create an aqueous solution with pH of

2

EASY

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

Which one of the following statements does not define the characteristic property of water- "Water is a universal solvent" ?

HARD

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

At a certain temperature, the value of

{p K}_{w}

13.4

and the measured

p H

of a solution is

7

. The solution is:

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

At what molar concentration of HCl will its aqueous solution have an [H⁺] to which equal contribution come from HCl and H₂O at 90^oC.

[K_w of H₂O = 10^-12 M² at 90^oC]

EASY

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

What is the [OH^–] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)₂ ?

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

The value of

{pK}_{w}

of water:

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

Equal volumes of three strong acid solutions of

p H 3, 4

and

5

are mixed in a vessel. What will be the

H^{+}

ion concentration in the mixture?

EASY

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

By applying the law of mass action, the equilibrium constant,

K

for the reaction

HA + H_{2} O ⇌ H_{3} O^{+} + A^{-}

, is given as

EASY

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

An aqueous solution in which the

H^{+}

ion concentration is greater than

10^{- 7}

M is said to be

EASY

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

The value of

{pK}_{w}

of water

EASY

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

For pure water at

25^{o} C

and

50^{o} C

, the correct statement is

EASY

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

90 ° C

, pure water has

[H_{3} O^{+}] = 10^{- 6} m o l L^{- 1}

. What is the value of

K_{w}

90 ° C

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

80 ° C,

distilled water has

H_{3} O^{+}

concentration equal to

1 \times 10^{- 6} mol / L

. The value of

K_{w}

at this temperature will be :-

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Ionic Product of Water

Which of the following is incorrect for pure water at the given temperature?

(At the given temperature $K_{w}$ for water is $4 \times 10^{- 14}$ )

Which combination of reactants best represents the amphoteric character of ZnOH2? I. Zn(OH)2 s, H+ aq II. Zn(OH)2 s, OH- aq III. Zn(OH)2 s, H2O l IV. Zn(OH)2 s, NH3 aq

Important Questions on Equilibrium

Learn and Prepare for any exam you want !

Which combination of reactants best represents the amphoteric character of $Zn {(OH)}_{2}$ ?

${I. Zn(OH)}_{2} (s), H^{+} (aq)$

${II. Zn(OH)}_{2} (s), {OH}^{-} (aq)$

${III. Zn(OH)}_{2} (s), H_{2} O (l)$

${IV. Zn(OH)}_{2} (s), {NH}_{3} (aq)$