JEE CHEMISTRY UNIT 08
QUIZ NO 4
TOTAL QUESTIONS = 20
1. The graph of [A] vs time for a zero-order reaction is
A. A straight line with a positive slope
B. An exponential curve
C. A parabola
D. A straight line with a negative slope
2. The order of a reaction is determined by
A. Stoichiometry of the reaction
B. Temperature of the reaction
C. Catalyst used
D. Rate law
3. The dimension of the rate constant for a second-order reaction is
A. L^2 mol^-2 s^-1
B. mol L^-1 s^-1
C. L mol^-1 s^-1
D. s^-1
4. Which of the following plots represents a first-order reaction?
A. 1/[A] vs time
B. ln[A] vs time
C. [A] vs time
D. [A]^2 vs time
5. The rate of a reaction is directly proportional to the
A. Temperature of the system
B. Pressure of reactants
C. Volume of reactants
D. Concentration of reactants
6. In a pseudo-first-order reaction,
A. All reactants are in the same concentration
B. The reaction is second order
C. The reaction is zero order
D. One reactant is present in excess
7. The time required for a first-order reaction to complete 75% is
A. Equal to half-life
B. Double the half-life
C. Three times the half-life
D. Four times the half-life
8. In a first-order reaction, the time required to complete 75% of the reaction is
A. Three times the half-life
B. Equal to half-life
C. Twice the half-life
D. Four times the half-life
9. The rate constant of a reaction increases by a factor of 4 when the temperature is raised from 300 K to 310 K. The activation energy is approximately
A. 35.4 kJ/mol
B. 25.6 kJ/mol
C. 42.1 kJ/mol
D. 52.8 kJ/mol
10. The half-life of a first-order reaction is
A. Directly proportional to the initial concentration
B. Independent of the initial concentration
C. Inversely proportional to the initial concentration
D. Exponentially proportional to the initial concentration
11. The half-life of a first-order reaction is 10 minutes. The time required to complete 87.5% of the reaction is
A. 40 minutes
B. 20 minutes
C. 50 minutes
D. 30 minutes
12. For a reaction A + B → C, if doubling the concentration of A doubles the rate and doubling the concentration of B quadruples the rate, the overall order of the reaction is
A. 4
B. 2
C. 1
D. 3
13. The activation energy of a reaction is zero. The rate constant is
A. Inversely proportional to temperature
B. Exponentially dependent on temperature
C. Directly proportional to temperature
D. Independent of temperature
14. For a zero-order reaction, the rate of reaction
A. Increases with concentration
B. Is independent of concentration
C. Is exponentially dependent on concentration
D. Decreases with concentration
15. The Arrhenius equation relates the rate constant of a reaction to
A. Pressure and temperature
B. Volume and activation energy
C. Temperature and activation energy
D. Concentration and temperature
16. If the rate of a reaction is independent of the concentration of reactants, it is
A. A second-order reaction
B. A pseudo-first-order reaction
C. A first-order reaction
D. A zero-order reaction
17. The unit of the rate constant for a first-order reaction is
A. L mol^-1 s^-1
B. mol L^-1 s^-1
C. mol^-1 L s^-1
D. s^-1
18. The rate of a reaction doubles for every 10°C rise in temperature. This is due to
A. Increase in activation energy
B. Increase in collision frequency
C. Increase in molecular size
D. Increase in fraction of molecules with sufficient energy
19. The reaction A → B + C follows a first-order rate law. If the initial concentration of A is 1 M, the concentration of A after one half-life is
A. 0.75 M
B. 0.25 M
C. 0.5 M
D. 0.1 M
20. The slope of the plot ln(k) vs 1/T gives
A. 1/Ea
B. ln(A)
C. +Ea/R
D. -Ea/R
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