The solution with p H value close to 1 is

75 m L o f 0 . 2 M H C l + 25 m L o f 0 . 2 M N a O H

10 m L o f 0 . 1 M H C l + 90 m L o f 0 . 1 M N a O H

55 m L o f 0 . 1 M H C l + 45 m L o f 0 . 1 M N a O H

75 m L o f 0 . 2 M H C l + 25 m L o f 0 . 1 M N a O H

The exothermic formation of ClF 3 is represented by the following equation: Cl 2 g + 3 F 2 g ⇌ 2 ClF 3 g ; ΔH = - 329 kJ Which of the following will increase the quantity of ClF 3 in the equilibrium mixture of Cl 2 , F 2 and ClF 3 ?

Increasing the volume of the container.

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Earn 100

A decimolar solution of $HCl$ is saturated with $H_{2} S$ gas. Calculate the minimum $[{Cu}^{2 +}]$ ion that will saturate the above solution with $CuS$ . Given $K_{sp}$ of $CuS = 6.4 \times 10^{- 36}, K_{a}$ for $H_{2} S = 9.6 \times 10^{- 21}$ and solubility of $H_{2} S = 0.1 mole {litre}^{- 1}$ .

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Important Questions on Equilibrium

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 131

0.98 g H_{3} {PO}_{4}

is dissolved in

100 mL

a buffer solution

(pH = 5) .

If the equilibrium concentrations of

H_{2} {PO}_{4}^{-}, {HPO}_{4}^{2 -}, {PO}_{4}^{3 -}

and

H_{3} {PO}_{4}

are

C_{1}, C_{2}, C_{3}

and

C_{4}

respectively. Find

{pC}_{1} + {pC}_{2} + {pC}_{3} + {pC}_{4} ({pC}_{i} = - {logC}_{i};

where

i = 1, 2, 3, 4)

Given: For

H_{3} {PO}_{4}, K_{a_{1}} = 10^{- 3}, K_{a_{2}} = 10^{- 8}, K_{a_{9}} = 10^{- 12}

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Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 134

On addition to

V mL

volume of

0.1 M KOH

, buffer capacity is found maximum at

{pH}_{solution} = x (> 7)

when it is titrated against

50 mL, 0.2 M H_{2} {CO}_{3} .

For

(H_{2} {CO}_{3} : K_{a_{1}} = 4.3 \times 10^{- 6}, K_{a_{2}} = 5.6 \times 10^{- 11})

Report your answer as

(V + x) \times 0.4,

rounding it off to the nearest whole number.

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 135

The solubility product of ${Ag}_{2} C_{2} O_{4}$ at $25 ° C$ is $1.29 \times 10^{- 11} {mol}^{3} L^{- 3} .$ A solution of $K_{2} C_{2} O_{4}$ containing
$0.152$ mole in $500 mL$ water.is shaken with an excess of ${Ag}_{2} {CO}_{3}$ till the following equilibrium is reached:

${Ag}_{2} {CO}_{3} (s) + K_{2} C_{2} O_{4} (aq) ⇌ {Ag}_{2} C_{2} O_{4} (s) + K_{2} {CO}_{3} (aq)$ .

At equilibrium, the solution contains $0.0358$ mole of $K_{2} {CO}_{3}$ . Assuming the degree of dissociation of $K_{2} C_{2} O_{4}$ and $K_{2} {CO}_{3}$ to be equal, if the solubility product of ${Ag}_{2} {CO}_{3}$ is $3.794 \times 10^{- x} {mol}^{3} L^{- 3}$ , find $x .$

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Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 137

0.1

millimole of

{CdSO}_{4}

are present in

10 mL

acid solution of

0.08 M HCI

. Now

H_{2} S

is passed to precipitate all the

{Cd}^{2 +}

ions. Find the

pOH

of the solution after filtering off precipitate, boiling off

H_{2} S

and making the solution

100 mL

by adding

H_{2} O .

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Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 139

$C M$ fluoroacetic acid solution was found to contain $[H^{+}] = 1.5 \times 10^{- 3} M . K_{a}$ of fluoroacetic acid $= 2.5 \times 10^{- 3}$ . Then:

EASY

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Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 144

The solution with

p H

value close to

1

MEDIUM

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 145

Which of the following statement/s is/are correct about weak acids in aqueous solutions?

I. When $pH = {pK}_{a}$ of a monoprotic acid, $50 %$ of the acid is ionised
Il. If $pH = {pKa}_{2}$ of a diprotic acid, the average charge of all the ionised species is $0.5$
Ill. When $pH = pKa + 1, 10 %$ of the acid is ionised
IV. When $pH = 7, 50 %$ of a monibasic acid is ionized.

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Alpha Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>Exercise-2>Q 146

(a)

For which of the following, water would behave as a levelling solvent and for which, it would behave as a differentiating solvent? Strong acids, weak acids, strong bases, weak bases.

(b)

For which of the following, glacial acetic acid would behave as a levelling solvent and for which, it would behave as a differentiating solvent? Strong acids, weak acids, strong bases, weak bases.

(c)

For which of the following, liquid ammonia would behave as a levelling solvent and for which, it would behave as a differentiating solvent? Strong acids, weak acids, strong bases, weak bases.

A decimolar solution of HCl is saturated with H2S gas. Calculate the minimum Cu2+ ion that will saturate the above solution with CuS. Given Ksp of CuS=6.4×10-36, Ka for H2S=9.6×10-21 and solubility of H2S=0.1 mole litre-1.

Important Questions on Equilibrium

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