## Law of chemical equilibrium & Equilibrium constant MCQ Advance level

Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. 4 moles of A are mixed with 4 moles of B. At equilibrium for the reaction A + B ⇌ C + D, 2 moles of C and D are formed. The equilibrium constant for the reaction will be

•  1/4
•  1/2
•  1
•  4

1

Q2. HI was heated in a closed tube at 440*C till equilibrium is obtained. At this temperature 22% of HI was dissociated. The equilibrium constant for this dissociation will be

•  0.282
•  0.0796
•  0.0199
•  1.99

0.0199

Q3. A reversible chemical reaction having two reactants in equilibrium. If the concentrations of the reactants are doubled, then the equilibrium constant will

•  Also be doubled
•  Be halved
•  Become one fourth
•  Remain the same

Remain the same

Q4. Partial pressures of A, B, C and D on the basis of gaseous system A + 2B ⇌ C + 3D are A = 0.20; B = 0.10; C = 0.30 and D = 0.50 atm. the numerical value of equilibrium constant is

•  11.25
•  18.75
•  5
•  3.75

18.75

Q5. In a reaction A + B ⇌ C + D, the concentrations of A, B, C and D (in moles/litre) are 0.5, 0.8, 0.4 and 1.0 respectively. The equilibrium constant is

•  0.1
•  1.0
•  10
•  ∞

1.0

Q6.  In a chemical equilibrium A + B ⇌ C + D, when one mole each of the two reactants are mixed, 0.6 mole each of the products are formed. The equilibrium constant calculated is

•  1
•  0.36
•  2.25
•  4/9

2.25

Q7. If concentration of reactants is increased by 'x' then K becomes

•  In (K/x)
•  K/x
•  K+x
•  K

K

Q8.  For a reversible reaction, if concentrations of the reactants are doubled, then equilibrium

•  Is halved
•  Is doubled
•  Remains same
•  Becomes 1/4th

Remains same

Q9. In the equilibrium AB ⇌ A + B; if the equilibrium concentration of A is doubled, the equilibrium concentration of B would become

•  Twice
•  Half
•  1/4th
•  1/8th

1/8th

Q10. In a reversible reaction two substances are in equilibrium. If the concentration of each one is doubled, the equilibrium constant will be

•  Reduced to half its original value
•  Reduced to one fourth of its
•  Doubled
•  Constant

Constant

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