Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 71

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IMPORTANT

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When ${NO}_{2}$ is bubbled into water, if disproportionates completely into ${HNO}_{2}$ and ${HNO}_{3}$

$2 {NO}_{2} + H_{2} O (l) \to {HNO}_{2} (aq .) + {HNO}_{3} (aq .)$

The concentration of ${NO}_{2}$ in a solution prepared by dissolving $0.05 mole of {NO}_{2}$ gas in $1 litre H_{2} O$ is $\{K_{a} ({HNO}_{2}) = 5 \times 10^{- 4}\}$

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Important Questions on Equilibrium

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 73

Which of the following is most soluble in water?

MEDIUM

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 74

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

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 75

A well is dug in a bed of rock containing fluorspar

({CaF}_{2})

If the well contains

20000 L

of water, what is the amount of

F^{-}

in it?

K_{sp} = 4 \times 10^{- 11} (10^{1 / 3} = 2.15)

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 76

If $HA + NaOH \to NaA + H_{2} O$ $∆ H = - 12 kcal$

and $HB + NaOH \to NaB + H_{2} O$ $∆ H = - 11 kcal$

then equimolar solution of which acid has higher $pH$ -

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 79

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 .

HARD

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 80

The self-ionisation constant for pure formic acid,

K = [{HCOOH}_{2}^{+}] [{HCOO}^{-}]

has been estimated as

10^{- 6}

at room temperature. The density of formic acid is

1.15 g / {cm}^{3} .

What percentage of formic acid molecules in pure fomic acid are converted to formate ion?

HARD

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 81

pH

of a saturated solution of silver salt of monobasic acid

HA

is found to be

9

. Find the

K_{sp}

of sparingly soluble salt

AgA (s)

. Given

K_{a} (HA) = 10^{- 10}

HARD

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-2>Q 82

A

2.5 g

impure sample containing weak monoacidic base (Mol. wt.

= 45 u

) is dissolved in

100 mL

water and titrated with

0.5 M

HCI

. When

{(\frac{1}{5})}^{th}

of the base was neutralised, the

pH

was found to be

9

and at equivalence point,

pH

of solution is

4.5

. Select correct statement(s):