# Chemical Equilibrium (Law of Chemical Equilibrium and Equilibrium Constant) MCQs

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## Law of Chemical Equilibrium and Equilibrium Constant MCQs

a) 20 units

b) 600 units

c) 50 units

d) 10 units

#### 2. If the initial concentrations of reactants in a reaction increase then the equilibrium constant

a) also increases

b) decreases

c) remains constant

d) may increase or decrease

#### 3. If we use activities in place of molar concentration in an equilibrium constant expression then what is the dimension of k?

a) it becomes dimensionless

b) the same units of molar concentration

c) units are related to the activity

d) cannot predict it

Answer: it becomes dimensionless

#### 4. What is the equilibrium constant of the following reaction: 4NH3 + 5O2 → 4NO + 6H2O?

a) [NO][H2O]/[NH3][O2]

b) [C]c[D]d/[A]a[B]b

c) [NO4[H2]6/NH3]4[O2]5

d) [NO]4[H2O]6/[NH3]4[O2]5

a) 0.04

b) 4

c) 25

d) 100

a) 0.622

b) 0.6

c) 0.63

d) 0.94

a) K

b) nK

c) Kn

d) K/n

#### 8. A reaction is given by aA + bB → cC + dD. How do you represent an equilibrium constant?

a) [A]a[B]b/[C]c[D]d

b) [C]c[D]d/[A]a[B]b

c) [A][B]/[C][D]

d) [C][D]/[A][B]

a) constant

b) unique

c) the same

d) cannot say

#### 10. What does it indicate having a higher equilibrium constant?

a) reaction occurs faster

b) rate of backward reaction is faster

c) both the backward and forward reactions are equal

d) reaction may be slower than usual

Answer: reaction occurs faster