JEE CHEMISTRY UNIT 08
QUIZ NO 1
TOTAL QUESTIONS = 20
1. The rate of a chemical reaction depends on;Concentration of reactants;Temperature;Presence of a catalyst;All of the above;D
A.
B.
C.
D.
2. The collision theory of reaction rates assumes that
A. Reactant molecules must collide with proper orientation
B. Neither A nor B is correct
C. Both A and B are correct
D. Reactant molecules must collide with sufficient energy
3. Which of the following does not affect the rate of a chemical reaction?
A. Surface area of reactants
B. Catalyst
C. State of equilibrium
D. Temperature
4. Which of the following factors does not affect the rate of a chemical reaction?
A. Nature of reactants
B. Presence of inert gases
C. Catalyst
D. Temperature
5. The rate of a chemical reaction is determined by
A. Formation of intermediate
B. Product concentration
C. Rate-determining step
D. Fastest step in the reaction
6. The rate constant of a reaction at 500 K is 10^-3 s^-1, and at 600 K, it is 10^-2 s^-1. The activation energy of the reaction is approximately
A. 42.1 kJ/mol
B. 54.6 kJ/mol
C. 34.5 kJ/mol
D. 25.0 kJ/mol
7. For a reaction A → B, the rate constant k has units mol L^-1 s^-1. The order of the reaction is
A. Third
B. Second
C. Zero
D. First
8. The Arrhenius equation relates
A. Rate constant to temperature
B. Rate constant to pressure
C. Activation energy to temperature
D. Rate constant to activation energy
9. The rate constant of a reaction is 2.5 × 10^-4 s^-1. The reaction is of
A. Second order
B. First order
C. Zero order
D. Third order
10. Which of the following is true for a catalyst?
A. It is consumed during the reaction
B. It increases activation energy
C. It does not affect the activation energy
D. It decreases activation energy
11. In a zero-order reaction, the rate of reaction is
A. Directly proportional to the concentration of reactants
B. Inversely proportional to the concentration of reactants
C. Independent of the concentration of reactants
D. Exponentially dependent on the concentration of reactants
12. Which of the following plots represents a first-order reaction?
A. [A]^2 vs time
B. ln[A] vs time
C. 1/[A] vs time
D. [A] vs time
13. The unit of the rate constant for a zero-order reaction is
A. L mol^-1 s^-1
B. mol^-1 L s^-1
C. s^-1
D. mol L^-1 s^-1
14. The rate law for a reaction is Rate = k[A][B]^2. If the concentration of A is tripled and B is doubled, the rate increases by a factor of
A. 36
B. 24
C. 18
D. 12
15. A catalyst increases the rate of reaction by
A. Decreasing activation energy
B. Increasing the energy of reactants
C. Increasing activation energy
D. Changing equilibrium constant
16. The units of the rate constant for a second-order reaction are
A. s^-1
B. L mol^-1 s^-1
C. mol^-1 L s^-1
D. mol L^-1 s^-1
17. The half-life of a zero-order reaction is proportional to
A. Independent of initial concentration
B. Initial concentration
C. Inverse of initial concentration
D. Square of initial concentration
18. The rate constant of a reaction increases with increase in temperature because
A. Activation energy decreases
B. More molecules have energy greater than activation energy
C. Collision frequency increases
D. Equilibrium constant increases
19. The activation energy of a reaction is
A. The energy of transition state
B. The minimum energy required to start the reaction
C. The energy released during the reaction
D. The energy difference between reactants and products
20. The half-life of a zero-order reaction is proportional to
A. Initial concentration
B. Inverse of initial concentration
C. Square of initial concentration
D. Independent of initial concentration
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