Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 24

EASY

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IMPORTANT

Earn 100

$20.0$ grams of ${CaCO}_{3} (s)$ were placed in a closed vessel, heated & maintained at $727 ° C$ under equilibrium ${CaCO}_{3} (s) ⇌ CaO (s) + {CO}_{2} (g)$ and it is found that $75 %$ of ${CaCO}_{3}$ was decomposed. What is the value of $K_{p}$ ? The volume of the container was $15$ litres.

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Important Questions on Equilibrium

EASY

JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 25

Consider the reaction of chloromethane with

{OH}^{-}

in aqueous solution

{CH}_{3} Cl (aq) + {OH}^{-} (aq) ⇋_{k_{r}}^{k_{f}} {CH}_{3} OH (aq) + {Cl}^{-} (aq)

At

25 ° C

, the rate constant for the forward reaction is

6 \times 10^{6} M^{1} s^{- 1}

, and the equilibrium constant

K_{c}

is

1 \times 10^{16}

. If the rate constant for the reverse reaction at

25 ° C

is

x \times 10^{- y}

then calculate value of

(y - x)

.

HARD

JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 26

A sample of HI

(9.6 \times 10^{- 3} mol)

was placed in an empty

2.00 L

container at

1000 K

. After equilibrium was reached, the concentration of

I_{2}

was

8 \times 10^{- 4} M

. Calculate the value of

K_{c}

at

1000 K

for the reaction

H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)

.

HARD

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 27

When

0.5 mol

of

N_{2} O_{4}

is placed in a

4.00 L

reaction vessel and heated at

400 K, 79.3 %

of the

N_{2} O_{4}

decomposes to

{NO}_{2}

.
Calculate

K_{p}

at

400 K

for the reaction

N_{2} O_{4} (g) ⇌ 2 {NO}_{2} (g)

. Give answer to the nearest integer value.

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Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 44

Calculate the ratio of degree of dissociation

(α_{2} / α_{1})

when

1 M

acetic acid solution is diluted to

\frac{1}{100}

times. (Given

K_{a} = 1.8 \times 10^{- 5}

)

HARD

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 45

Calculate the

pH

of a solution prepared by mixing

50.0 mL

of

0.200 M {CH}_{3} COOH

and

50.0 mL

of

0.100 M NaOH

.

[K_{a ({CH}_{3} COOH)} = 1.8 \times 10^{- 5}]

HARD

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 46

50 mL

of

0.1 M NaOH

is added to

75 mL

of

0.1 M {NH}_{4} Cl

to make a basic buffer. If

{pK}_{a}

of

{NH}_{4}^{+}

is

9.26

, salculate

pH

.

HARD

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 47

A certain solution has a hydrogen ion concentration

4 \times 10^{- 3} M

. For the indicator thymol blue.

pH

is

2.0

when half the indicator is in unionised from. Find the

%

of indicator in unionised form in the solution with

[H^{+}] = 4 \times 10^{- 3} M

.

MEDIUM

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 48

What is the

pH

of

0.1 M {NaHCO}_{3}

?

K_{1} = 4.5 \times 10^{- 7}, K_{2} = 4.5 \times 10^{- 11}

for carbonic acids.