JEE Chemistry - MCQ Practice Questions

The rate of a chemical reaction is defined as the change in concentration of reactants or products per unit time. Which of the following is NOT a factor affecting reaction rate?

The half-life of a zero-order reaction is:

A reaction has a rate constant of k = 2.5 × 10⁻⁴ s⁻¹ at 298 K. What is the order of this reaction if the units of k are s⁻¹?

Which of the following statements about activation energy (Eₐ) is correct?

The collision theory of reaction rates explains that a reaction occurs when molecules collide with:

For the reaction 2NO + Cl₂ → 2NOCl, the rate law is found to be Rate = k[NO]²[Cl₂]. The order with respect to NO is:

A zero-order reaction has an initial concentration of 0.5 M and rate constant k = 0.02 M/s. The time taken for the concentration to reduce to 0.1 M is:

In a reaction mechanism with fast pre-equilibrium followed by slow step, which statement is correct?

For the reaction: A + B → Products with Rate = k[A][B]², what is the overall order of reaction?

A catalyst increases the rate of reaction by:

For a reaction with rate law Rate = k[A]⁰[B]¹, if [B] is increased 4 times while [A] remains constant, the rate increases by:

For the reaction A → B, experimental data shows: [A] vs time is a straight line. This indicates:

For an elementary reaction: A + A + B → Products, the rate law is:

For the reaction 2NO + O₂ → 2NO₂, the rate law is Rate = k[NO]²[O₂]. What is the overall order of reaction?

Half-life of a first-order reaction is 30 minutes. What fraction of reactant remains after 90 minutes?

Which of the following statements about collision theory is INCORRECT?

For a zero-order reaction, the integrated rate law is [A] = [A]₀ - kt. If [A]₀ = 0.5 M and k = 0.02 M·s⁻¹, find time when [A] = 0

Consider the mechanism: (1) A + B ⇌ C (fast equilibrium), (2) C + D → E + F (slow). Which is the rate-determining step?

Which factor does NOT affect the rate constant k of a reaction?