Class 12 Chemical Kinetics Worksheet

1. Q1. For the reaction 2A + B → C, the rate of formation of C is 0.5 mol L⁻¹ s⁻¹. What is the rate of disappearance of A?
   • 0.25 mol L⁻¹ s⁻¹
   • 0.5 mol L⁻¹ s⁻¹
   • 1.0 mol L⁻¹ s⁻¹
   • 2.0 mol L⁻¹ s⁻¹
2. Q2. Which of the following statements is INCORRECT regarding the order of a reaction?
   • It can be a fraction.
   • It can be zero.
   • It is always equal to the sum of the stoichiometric coefficients of reactants in a balanced chemical equation.
   • It is determined experimentally.
3. Q3. The half-life of a first-order reaction is 60 minutes. How much time will it take to reduce the concentration of the reactant to 1/8th of its initial value?
   • 60 minutes
   • 120 minutes
   • 180 minutes
   • 240 minutes
4. Q4. A catalyst increases the rate of a chemical reaction by:
   • Increasing the activation energy.
   • Decreasing the activation energy.
   • Increasing the temperature of the reaction.
   • Changing the equilibrium constant of the reaction.
5. Q5. For a reaction, the plots of ln[A] versus time gives a straight line with a negative slope. This reaction is of ____ order.
   • Zero
   • First
   • Second
   • Third

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