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Law of Chemical Equilibrium and Equilibrium Constant MCQs
1. The equilibrium constant of a reaction is 20 units and the equilibrium constant of other reaction is 30 units when both the reactions are added up together then the equilibrium constant of the resultant reaction is given by _____________
a) 20 units
b) 600 units
c) 50 units
d) 10 units
Answer: 600 units
2. If the initial concentrations of reactants in a reaction increase then the equilibrium constant
a) also increases
c) remains constant
d) may increase or decrease
Answer: remains constant
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?
5. for the reaction H2(g) + Br2(g) ? 2HBr(g) the equilibrium constant is given as 0.04 then what is the equilibrium constant for the reaction 2HBr(g) ? H2(g) + Br2(g)?
6. Given that at 800k the concentrations are as follows: N2=3.0 × 10–3M, O2 = 4.2 × 10–3M and NO = 2.8 × 10–3M, what is the equilibrium constant for the reaction N2(g) + O2(g) ? 2NO(g)?
7. If the chemical reaction is: aA + bB ? cC + dD and K is the equilibrium constant. Then what is the equilibrium constant of the reaction naA + nbB ? ncC + ndD?
8. A reaction is given by aA + bB ? cC + dD. How do you represent an equilibrium constant?
9. The value of equilibrium constant for different chemical reactions at a particular temperature is
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