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IMPORTANT

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Solid Ammonium carbamate dissociates as : ${NH}_{2} {COONH}_{4} (s) ⇌ 2 {NH}_{3} (g) + {CO}_{2} (g) .$ In a closed vessel solid ammonium carbamate is in equilibrium with its dissociation products. At equilibrium, ammonia is added such that the partial pressure of ${NH}_{3}$ at new equilibrium now equals the original total pressure. Calculate the ratio of total pressure at new equilibrium to that of original total pressure.

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Important Questions on Equilibrium

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JEE Main/Advance

IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 22

A sample of

{CaCO}_{3} (s)

is introduced into a sealed container of volume

0.821

litre & heated to

1000 K

until equilibrium is reached. The equilibrium constant for the reaction

{CaCO}_{3} (s) ⇌ CaO (s) + {CO}_{2} (g)

4 \times 10^{2}

atm at this temperature. Calculate the mass of

CaO

present at equilibrium.

MEDIUM

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IMPORTANT

Beta Question Bank for Engineering: Chemistry>Chapter 5 - Equilibrium>EXERCISE-3>Q 23

Anhydrous calcium chloride is often used as a dessicant. In the presence of excess of

{CaCl}_{2}

, the amount of the water taken up is governed by

K_{p} = 6.4 \times 10^{85}

for the following reaction at room temperature,

{CaCl}_{2} (s) + 6 H_{2} O (g) ⇌ {CaCl}_{2} \cdot 6 H_{2} O (s)

. The equilibrium vapour pressure of water in a closed vessel that contains

{CaCl}_{2} (s)

x \times 10^{- y}

then calculate value of

\frac{y}{x}

EASY

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IMPORTANT

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

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 %

{CaCO}_{3}

was decomposed. What is the value of

K_{p}

? The volume of the container was

15

litres.

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)

25 ° C

, the rate constant for the forward reaction is

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

, and the equilibrium constant

K_{c}

1 \times 10^{16}

. If the rate constant for the reverse reaction at

25 ° C

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}

1000 K

for the reaction

H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)

HARD

JEE Main/Advance

IMPORTANT

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

When

0.5 mol

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}

400 K

for the reaction

N_{2} O_{4} (g) ⇌ 2 {NO}_{2} (g)

. Give answer to the nearest integer value.

MEDIUM

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IMPORTANT

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

JEE Main/Advance

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

0.200 M {CH}_{3} COOH

and

50.0 mL

0.100 M NaOH

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

Important Questions on Equilibrium

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