Chemical Kinetics Sample Questions for Class 12
Question 1
Consider the following chemical equation for a decomposition reaction:H_2O_2 (aq) rarr H_2O(l) + (1/2)O_2(g)This represents what type of reaction in kinetics?
A. Unimolecular reaction
B. Bimolecular reaction
C. Trimolecular reaction
D. Tetramolecular reaction
Question 2
In a reversible chemical reaction, which of the following parameters remains unchanged even with the addition of a catalyst?
A. Equilibrium constant
B. Rate of reaction
C. Percentage yield of reaction
D. Concentration of reactants
Question 3
In the reaction, 2A + B rarr A_2B, if the concentration A is doubled and that of B is halved, then the rate of reaction will
A. increase by 4 times.
B. decreases by 2 times.
C. remain the same.
D. increase by 2 times.
Question 4
During H_2O_2 decomposition, a small I^(_) ion is used as a catalyst. What is the change in activation energy for this chemical reaction?
A. 76 kJ/mol to 57 kJ/mol
B. 60 kJ/mol to 45 kJ/mol
C. 40 kJ/mol to 27 kJ/mol
D. 20 kJ/mol to 35 kJ/mol
Question 5
What speeds up chemical reactions?
A. enzymes
B. pH
C. biochemical reactions
D. activation energy