The equilibrium expression, K_c= [CO₂] represents the reaction.

1

(a)

C(s) + O₂(g) ⇌ CO₂(g)

(b)

CaCO₃(s) ⇌ CaO(s) + CO₂(g)

(c)

CO(g) + \(\frac { 1 }{ 2 } \) O₂(g) ⇌ CO₂(g)

(d)

CaO(s) + CO₂(g) ⇌ CaCO₃(s)

Hydrogen molecule (H₂) can be dissociated into hydrogen atoms (H). Which one of the following changes will not increase the number of atoms present at equilibrium?

1

(a)

adding H atoms

(b)

(b) increasing the temperature

(c)

increasing the total pressure

(d)

increasing the volume of the container

A catalyst will increase the rate of a chemical reaction by ______.

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(a)

shifting the equilibrium to the right

(b)

shifting the equilibrium to the left

(c)

lowering the activation energy

(d)

increasing the activation energy

What is the correct expression for the representation of the solubility product constant of Ag₂ CrO₄ ?

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(a)

[Ag⁺]² [CrO₄^2-]

(b)

[2Ag⁺] [CrO₄^2-]

(c)

[Ag⁺][CrO₄^2-]

(d)

[2Ag⁺]²[CrO₄^2-]

In a closed system
A(S) ⇌ 4 B(g) + 3 C(g)
If partial pressure of C is doubled, then partial pressure of B will be _____.

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(a)

\(2\sqrt { 2 } \)times the original value

(b)

\(\frac { 1 }{ 2 } \)times the original value

(c)

2 times of the original value

(d)

\(\frac { 1 }{ 2\sqrt { 2 } } \)times of the original value

H₂ + S ⇌ H₂S + energy.
In this reversible reaction, select the factor which will shift the equilibrium to the right.

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(a)

adding heat

(b)

adding H₂S

(c)

blocking hydrogen gas reaction

(d)

removing hydrogen sulphide gas

What effect does a catalyst have on the equilibrium position of a reaction?

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(a)

a catalyst favours the formation of products

(b)

a catalyst favours the formation of reactants

(c)

a catalyst does not change the equilibrium position of a reaction

(d)

a catalyst may favour reactants or product formation, depending upon the direction in which the reaction is written.

A chemist dissolves an excess of BaSO₄ in pure water at 25°C if its K_sp = 1 x 10^-10 what is the concentration of barium in the water?

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(a)

10^-4 M

(b)

10^-5 M

(c)

10^-15 M

(d)

10^-6 M

If in a mixture where Q = k is combined, then what happens?

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(a)

the reaction shift towards products

(b)

the reaction shift towards reactants

(c)

nothing appears to happen, but forward and reverse are continuing at the same rate

(d)

nothing happens

A tank is full of water. Water is coming in as well as going out at same rate. What will happen to level of water in a tank? What is name given to such a state?

1

(a)

It will remain the same because rate of inflow is equal to rate of outflow. The state is called of 'equilibrium'.

For an exothermic reaction, what happens to the equilibrium constant if temperature is increased?

1

(a)

\(k=\frac { { k }_{ f } }{ { k }_{ b } } \) . In exothermic reaction, with increase of temperature, k_b increases much more than k_f. Hence, K decreases.