Write any one activity to increase the red colour in the following reaction. Fe ( NO 3 ) 3 ( aq ) ( Light yellow ) + 3 KCNS ( aq ) ( Colourless ) ⇌ Fe ( CNS ) 3 ( aq ) ( red ) + 3 KNO 3 ( aq ) ( Colourless )

Fe ( NO 3 ) 3 ( aq ) ( Light yellow ) + 3 KCNS ( aq ) ( Colourless ) ⇌ Fe ( CNS ) 3 ( aq ) ( red ) + 3 KNO 3 ( aq ) ( Colourless ) In the given reaction, adding reactant will lead to increase in product, thus on adding Fe ( NO 3 ) 3 or KCNS the red colour can be increased.

Graph of a reversible process; N 2 + 3 H 2 ⇌ 2 NH 3 + Heat is given. Analyse the graph and answer the following question. Identify the part of the graph which represents the forward reaction [ OA, BA, AC]

BA part of the graph represents the forward reaction. The forward reaction speeds up temporarily as a result of the addition of reactants. The position of equilibrium shifts as more ammonia ( NH 3 ) is produced. The concentration of ammonia increases, while the concentration of N 2 and H 2 decreases. The forward reaction in the production of ammonia is exothermic.

Graph of a reversible process; is given. Analyse the graph and answer the following question. Identify the part of the graph which represents the equilibrium state?

AC part of the graph represents the equilibrium state. At equilibrium, the rates of forward and backward reactions become equal. Even at equilibrium, the reactant molecules react to form product molecules and product molecules react to form reactant molecules. Hence, equilibrium is said to be dynamic equilibrium at the molecular level.

Consider the following thermodynamic data, A + B ⇌ C + D Temperature Equilibrium constant 25 ° C 1 35 ° C 0 . 8 45 ° C 0 . 65 Select the incorrect statemen.

∆ S ° at 25 ° C is positive

∆ H ° of reaction is negative

∆ G ° of reaction at 25 ° C is negative

MEDIUM

Earn 100

Write an example for homogeneous equilibrium reaction.

Important Questions on Equilibrium

EASY

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

$H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)$

What is the effect of pressure in this reversible reaction? Explain.

EASY

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

Write any one activity to increase the red colour in the following reaction.

$\underset{(Light yellow)}{Fe {({NO}_{3})}_{3} (aq)} + \underset{(Colourless)}{3 KCNS (aq)} ⇌ \underset{(red)}{Fe {(CNS)}_{3} (aq)} + \underset{(Colourless)}{3 {KNO}_{3} (aq)} $

EASY

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

$H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)$

What is the total number of moles of reactants and products in the above reaction?

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

Among the following, the correct statement about the chemical equilibrium is.

EASY

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

Graph of a reversible process;

$N_{2} + 3 H_{2} \overset{}{⇌} 2 {NH}_{3} + Heat$

is given. Analyse the graph and answer the following question.

Question Image

Identify the part of the graph which represents the forward reaction

[ OA, BA, AC]

EASY

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

The

pH

of the blood is maintained by buffer system given by

EASY

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

What happens to the rate of forward reaction of the equilibrium,

$2 {SO}_{2} (g) + O_{2} (g) ⇌ 2 {SO}_{3} (g) + Heat$ during the following situations?

(a) increase in temperature

(b) ${SO}_{3}$ is removed

EASY

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

Which one of the following statements is not correct?

HARD

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

The thermal dissociation equilibrium of

{CaCO}_{3} (s)

is studied under different conditions.

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

For this equilibrium, the correct statement(s) is/are

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

The equilibrium constant for the reaction is

P_{4} (s) + 50_{2} (g) ⇌ P_{4} 0_{10} (s)

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

Graph of a reversible process;

Question Image

is given. Analyse the graph and answer the following question.

Question Image

Identify the part of the graph which represents the equilibrium state?

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

Graph of a reversible process,

Question Image

is given. Analyse the graph and answer the following question.

Question Image

From the given statements, select the correct ones regarding chemical equilibrium.

(i0 The chemical equilibrium is 'static' at the molecular level.

(ii) Both reactants and products co-exist.

(iii) The rates of forward reaction and backward reactions are equal.

(iv) Chemical equilibrium is attained in an open system.

EASY

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

Which of the following statement is correct about chemical equilibrium?

(i) At equilibrium both the reactants and products coexist.

(ii) At equilibrium rate of forward reaction is greater than the rate of backward reaction.

HARD

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

100 ml

sample of a

0.5 M

solution of a diprotic acid

(H_{2} A)

is titrated against the strong base

NaOH

. Molarity of

NaOH (aq)

0.5 M

. What is the minimum volume of 0.5

M NaOH

required to reach a

pH

8

? (given

{pK}_{a_{1}}

and

{pK}_{a_{2}}

H_{2} A

are

5

and

8

)

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

In the reaction

2 P (g) + Q (g) ⇌ 3 R (g) + S (g)

, if

2 moles

each of

P

and

Q

taken initially in a

1

L

flask, at equilibrium, which is true?

HARD

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

Consider the following thermodynamic data,

A + B ⇌ C + D

Temperature	Equilibrium constant
$25 ° C$	$1$
$35 ° C$	$0.8$
$45 ° C$	$0.65$

Select the incorrect statemen.

HARD

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

N_{2}

and

H_{2}

react to produce

{NH}_{3}

N_{2} (g) + 3 H_{2} (g) ⇌ 2 {NH}_{3} (g)

A mixture of

2

moles of

N_{2}

and

6

moles of

H_{2}

are introduced into a vessel and the extent of reaction is

40 %

. Then at constant temperature and pressure the ratio of final volume to the initial volume of gases is

EASY

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

Which of the following compounds helps in achieving equilibrium between

O_{2}

and

{CO}_{2}

, in the atmosphere?

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

The reaction,

{Naphthalene}_{(s)} ⇌ {Naphthalene}_{(g)}

is an example of

HARD

Chemistry>Physical Chemistry>Equilibrium>Types of Equilibrium

The following reaction was studied at $25 ° C$ with initial amount of $N_{2} O_{3}$ equal to $1 mol$
$N_{2} O_{3} (g) ⇌ {NO}_{2} (g) + NO (g)$
At equilibrium, the extent of reaction is found to be $0.3 mol$ for a total pressure of $1$ $bar$ then $Δ_{r} G °$ for reaction is approximately

$(Take \frac{1}{10.1} \approx \frac{1}{10})$

Write an example for homogeneous equilibrium reaction.

Important Questions on Equilibrium

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