NEET UG - Rate of reaction, factors affecting rate, order and molecularity, rate laws and rate constants One Line Questions & Answers

1. What is the instantaneous rate of reaction at time 't' for a reaction A -> Products? — -d[A]/dt

2. For a first-order reaction, the integrated rate law is given by: — [A]t = [A]₀ * e^(-kt)

3. For the reaction 2A + B -> C, if the rate law is Rate = k[A]^2[B]^1, what is the order of the reaction with respect to A? — 2

4. What is the molecularity of a unimolecular reaction? — 1

5. For the reaction R -> P, if the rate law is Rate = k[R]⁰, what is the order of the reaction? — 0

6. If the half-life of a first-order reaction is 30 minutes, what is the rate constant? — 0.01155 min⁻¹

7. If the rate of reaction doubles when the temperature is increased by 10°C, what is the approximate temperature coefficient? — 2

8. The rate law for the reaction 2NO(g) + O₂(g) -> 2NO₂(g) is found experimentally to be Rate = k[NO]²[O₂]. What is the molecularity of this reaction? — Cannot be determined from the rate law.

9. What is the order of the reaction A + B -> Products if the rate law is Rate = k[A]¹/²[B]¹? — 1.5

10. What is the order of reaction with respect to reactant A if doubling the concentration of A increases the rate of reaction by a factor of 8? — 3

11. For a reaction A + B -> Products, if the rate law is Rate = k[A][B]², what is the overall order of the reaction? — 3

12. For a bimolecular reaction, the molecularity is: — 2

13. For the reaction 2H₂ + 2NO -> 2H₂O + N₂, if the rate law is Rate = k[H₂][NO]², what is the overall order of the reaction? — 3

14. The rate law for a reaction can be determined by: — Experimental measurements of concentration versus time.

15. A reaction that proceeds in a single step is called: — Elementary reaction

16. The Arrhenius equation relates the rate constant to: — Temperature and activation energy.

17. Which of the following factors does NOT typically affect the rate of a chemical reaction? — Color of the reactants

18. The rate of reaction is defined as the rate of change of: — Concentration of reactants or products.

19. The rate of a reaction is generally increased by: — Increasing the concentration of reactants.

20. The rate constant 'k' of a reaction is: — Dependent on temperature but independent of concentration.

21. For a zero-order reaction, the rate of reaction is: — Independent of the concentration of the reactant.

22. If a reaction is exothermic and the activation energy for the forward reaction is Ea(f), what is the activation energy for the reverse reaction Ea(r)? — Ea(r) = Ea(f) - ΔH

23. If the rate of reaction is independent of the concentration of a reactant, it is: — Zero-order with respect to that reactant.

24. The collision theory states that for a reaction to occur, reactant molecules must: — Collide with sufficient kinetic energy and proper orientation.

25. A catalyst increases the rate of reaction by: — Decreasing the activation energy.

26. For a first-order reaction, the half-life (t₁/₂) is: — Independent of the initial concentration.

27. Which type of catalyst increases the rate of a reaction? — Positive catalyst

28. Which of the following statements is true about molecularity? — It is always an integer and usually less than or equal to 3.

29. What is the relationship between the rate constant (k) and temperature (T) described by the Arrhenius equation? — k = A * exp(-Ea/RT)

30. Which of the following units for the rate constant 'k' indicates a third-order reaction? — M⁻² s⁻¹

31. Which of the following is NOT a unit of rate of reaction? — mol⁻¹ L s⁻¹

32. Which of the following statements about order and molecularity is correct? — Order is determined experimentally, while molecularity is theoretical.

33. Which of the following factors has the most significant effect on the rate of a chemical reaction? — Activation energy

34. The rate of a reaction is defined as the rate of disappearance of a reactant or the rate of appearance of a product. For the reaction A -> B, this can be written as: — Rate = -d[A]/dt = +d[B]/dt

35. What is the unit of the rate constant (k) for a zero-order reaction? — mol L⁻¹ s⁻¹

36. For a second-order reaction, the unit of the rate constant (k) is: — L mol⁻¹ s⁻¹

37. The unit of the rate constant (k) for a third-order reaction is: — L² mol⁻² s⁻¹

38. What is the unit of the rate constant for a first-order reaction? — s⁻¹

39. What is the effect of a catalyst on the equilibrium position of a reversible reaction? — Does not affect it.

40. The term 'rate-determining step' refers to: — The slowest step in a reaction mechanism.

41. For a complex reaction, the rate of reaction is determined by: — The slowest step (rate-determining step).

42. The activation energy (Ea) of a reaction is: — The minimum energy required for reactants to form products.

43. Molecularity of a reaction is defined as: — The number of molecules that collide simultaneously with proper energy and orientation to cause a reaction.

44. The rate law of a reaction provides information about: — The dependence of the reaction rate on the concentration of reactants.

45. What happens to the rate of reaction if the concentration of a reactant involved in a zero-order reaction is doubled? — The rate remains unchanged.

46. The rate constant of a reaction decreases as the temperature increases. This implies: — The reaction is exothermic with a high activation energy.

47. The rate of a reaction is proportional to the frequency of effective collisions between reactant molecules. This statement is part of: — Collision theory

48. Which of the following is a characteristic of elementary reactions? — Their molecularity is equal to their order.

49. If the rate of reaction is directly proportional to the concentration of a reactant, it is said to be: — First-order with respect to that reactant.

Rate of reaction, factors affecting rate, order and molecularity, rate laws and rate constants - One Line Questions