JEE CHEMISTRY UNIT 08
QUIZ NO 2
TOTAL QUESTIONS = 20
1. The unit of rate constant for a third-order reaction is
A. mol^-1 L s^-1
B. s^-1
C. mol L^-1 s^-1
D. mol^-2 L^2 s^-1
2. The rate constant of a reaction increases with temperature because
A. Activation energy decreases
B. More molecules have energy greater than activation energy
C. Collision frequency increases
D. Equilibrium constant increases
3. The rate law for the reaction 2A + B → C is given by Rate = k[A]^2[B]. The overall order of the reaction is
A. 0
B. 3
C. 2
D. 1
4. Which of the following factors affects the rate constant of a reaction?
A. Volume
B. Pressure
C. Temperature
D. Concentration
5. In a pseudo-first-order reaction, the rate law is
A. Rate = k[A]^2
B. Rate = k[A][B]
C. Rate = k[B]
D. Rate = k[A]
6. The time required for half of the reactant to decompose is known as
A. Activation energy
B. Half-life
C. Rate constant
D. Reaction time
7. The graph of ln(k) vs 1/T for a chemical reaction is
A. A straight line with a positive slope
B. A parabola
C. A straight line with a negative slope
D. An exponential curve
8. The collision theory of reaction rates assumes that
A. Reactant molecules must collide with proper orientation
B. Reactant molecules must collide with sufficient energy
C. Neither A nor B is correct
D. Both A and B are correct
9. The order of a reaction can be determined from
A. Balanced chemical equation
B. Experimental data
C. Nature of the reactants
D. Reaction mechanism
10. The rate of a reaction is directly proportional to the
A. Pressure of reactants
B. Temperature of reactants
C. Volume of reactants
D. Concentration of reactants
11. The activation energy of a reaction is
A. The energy required to break the bonds of reactants
B. The energy difference between reactants and products
C. The energy released during the reaction
D. The minimum energy required for the reaction to occur
12. For a first-order reaction, the time required to complete 87.5% of the reaction is
A. Five half-lives
B. Two half-lives
C. Four half-lives
D. Three half-lives
13. The integrated rate law for a first-order reaction is
A. 1/[A] = 1/[A]₀ + kt
B. ln[A] = ln[A]₀ - kt
C. [A] = [A]₀ - kt
D. ln[A] = ln[A]₀ + kt
14. Which of the following statements is correct for a first-order reaction?
A. Rate is independent of concentration
B. Rate decreases exponentially with time
C. Rate is proportional to square of concentration
D. Rate is directly proportional to concentration
15. The rate constant of a reaction is 2.5 × 10^-4 s^-1. The reaction is of
A. Zero order
B. Second order
C. First order
D. Third order
16. For a reaction with rate law Rate = k[A][B]^2, if the concentration of B is doubled, the rate of reaction will
A. Double
B. Remain unchanged
C. Quadruple
D. Increase eightfold
17. The unit of the rate constant for a zero-order reaction is
A. s^-1
B. mol L^-1 s^-1
C. mol^-1 L s^-1
D. L mol^-1 s^-1
18. Which of the following statements is true for a catalyst?
A. It changes the equilibrium constant
B. It decreases the activation energy
C. It increases the activation energy
D. It is consumed during the reaction
19. The rate constant of a reaction increases with temperature due to
A. Increase in pressure
B. Decrease in activation energy
C. Decrease in molecular collisions
D. Increase in number of effective collisions
20. The slope of a plot of [A] vs time for a zero-order reaction is
A. +k
B. 1/k
C. -k
D. -1/k
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