A ⇌ B . In this reaction, k f is 2 × 10 - 3 and k b is 5 × 10 - 4 . Determine the value of K c .

The ratio of rate constant of forward direction and backward direction is known as equilibrium constant: K C = k f k b = 2 × 10 - 3 5 × 10 - 4 = 20 5 = 4

2 moles of PCl 5 when heated in a closed vessel of 2 litre capacity at equilibrium 40 % of PCl 5 dissociated in PCl 3 and Cl 2 . What is the value of the equilibrium constant?

For the given reaction, according to the question: PCl 5 ⇌ PCl 3 + Cl 2 t = 0 2 t = t equilibrium 2 - 0 . 8 0 . 8 0 . 8 So, PCl 5 = 1 . 2 2 = 0 . 6 ; PCl 3 = 0 . 8 2 = 0 . 4 Cl 2 = 0 . 8 2 = 0 . 4 The equilibrium constant: K C = PCl 3 Cl 2 PCl 5 = 0 . 4 × 0 . 4 0 . 6 = 1 . 6 0 . 6 = 0 . 267

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Earn 100

$4.5$ moles each of hydrogen and iodine heated in a sealed ten litre vessel. At equilibrium, $3$ moles of $HI$ were found. Determine the equilibrium constant for $H_{2} (g) + I_{2} (g) ⇌ 2 Hl (g)$ .

Important Questions on Chemical Equilibrium

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 7 - Chemical Equilibrium>EXERCISE>Q 46

4

moles of

A

are mixed with

4

moles of

B

, when

2

moles of

C

are formed at equilibrium, according to the reaction,

A + B ⇌ C + D

. Determine equilibrium constant.

MEDIUM

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 7 - Chemical Equilibrium>EXERCISE>Q 47

A ⇌ B

. In this reaction,

k_{f}

2 \times 10^{- 3}

and

k_{b}

5 \times 10^{- 4}

. Determine the value of

K_{c}

EASY

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 7 - Chemical Equilibrium>EXERCISE>Q 48

The equilibrium

N_{2} (g) + O_{2} (g) ⇌ 2 NO (g)

established in a reaction vessel of

2.5 L

capacity. The amounts of

N_{2}

and

O_{2}

taken at the start were respectively

2

moles and

4

moles. Half a mole of nitrogen has been used up at equilibrium. What is the molar concentration of nitric oxide?

HARD

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 7 - Chemical Equilibrium>EXERCISE>Q 49

2

moles of

{PCl}_{5}

when heated in a closed vessel of

2

litre capacity at equilibrium

40 %

{PCl}_{5}

dissociated in

{PCl}_{3}

and

{Cl}_{2}

. What is the value of the equilibrium constant?

HARD

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 7 - Chemical Equilibrium>EXERCISE>Q 50

K_{c} = 9

for the reaction,

A + B ⇌ C + D

. If

A

and

B

are taken in equal amounts, then what is the amount of

C

in equilibrium?

HARD

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 7 - Chemical Equilibrium>KVPY PROBLEMS (PREVIOUS YEARS)>Q 1

When

4

moles of

N_{2}

gas react with

16

moles of

H_{2}

gas in

10

litre vessel,

4

moles of ammonia gas is produced in the equilibrium mixture. The equilibrium constant

K_{c}

for this reaction in

{mol}^{- 2} {lit}^{2}

is:

MEDIUM

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 7 - Chemical Equilibrium>KVPY PROBLEMS (PREVIOUS YEARS)>Q 2

The equilibrium constant for the reaction

N_{2} + 3 H_{2} ⇌ 2 {NH}_{3}

400 K

41

. The equilibrium constant for the reaction

1 / 2 N_{2} + 3 / 2 H_{2} ⇌ {NH}_{3}

at the same temperature will be closest to:

HARD

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 7 - Chemical Equilibrium>KVPY PROBLEMS (PREVIOUS YEARS)>Q 3

Some reactions and their equilibrium constants given below :

${CuCl}_{4}^{2 -} + {Br}^{-} ⇌ {CuCl}_{3} {Br}^{2 -} + {Cl}^{-} K_{1}$

${CuCl}_{3} {Br}^{2 -} + {Br}^{-} ⇌ {CuCl}_{2} {Br}_{2} {}^{2 -}+ {Cl}^{-} K_{2}$

${CuCl}_{2} {Br}_{2} {}^{2 -}+ {Br}^{-} ⇌ {CuClBr}_{3} {}^{2 -}+ {Cl}^{-} K_{3}$

${CuClBr}_{3}^{2 -} + {Br}^{-} ⇌ {CuBr}_{4}^{2 -} + {Cl}^{-} K_{4}$

The equilibrium constant, $K$ , for the reaction ${CuCl}_{4}^{2 -} + 3 {Br}^{-} ⇌ {CuClBr}_{3}^{2 -} + 3 {Cl}^{-}$ , is:

4.5 moles each of hydrogen and iodine heated in a sealed ten litre vessel. At equilibrium, 3 moles of HI were found. Determine the equilibrium constant for H2 g+I2 g⇌2Hl g.

Important Questions on Chemical Equilibrium

Learn and Prepare for any exam you want !

$4.5$ moles each of hydrogen and iodine heated in a sealed ten litre vessel. At equilibrium, $3$ moles of $HI$ were found. Determine the equilibrium constant for $H_{2} (g) + I_{2} (g) ⇌ 2 Hl (g)$ .