Chemical Kinetics MCQ | Questions – Paper 3

For a reaction:  → 2B, rate of disappearance of 'A' is related to the rate of appearance of 'B' by the expression: [AIEEE 2008]

Which one of the following is a second order reaction? [Karnataka CET 2007]

Consider a reaction, aG + bH → Products.

When concentration of both the reactants G and H is doubled, the rate increases by eight times. However, when the concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is: [IIT JEE 2007]

If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately [CBSE PMT 2007]

In a first order reaction A → B, if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is [CBSE PMT 2007]

Consider the reaction,

2A + B → Products

When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is: [AIEEE 2007]

The energies of activation for forward and reverse reactions for A₂ + B₂  2AB are 180 kJ mol^–1 and 200 kJ mol^–1 respectively. The presence of a catalyst lowers the activation energy of both (forward and reverse) reactions by 100 kJ mol^–1. The enthalpy change of the reaction (A₂ + B₂ → 2AB) in the presence of catalyst will be (in kJ mol^–1): [AIEEE 2007]

For a reaction A + B → C + D if the concentration of A is doubled without altering the concentration of B, the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of the reaction is [Karnataka CET 2006]

Consider the reaction:

N₂(g) + 3H₂(g) → 2NH₃(g)

The equality relationship between  is [CBSE AIPMT 2006]

For the reaction: 2A + B → 3C + D

Which of the following does not express the reaction rate? [CBSE AIPMT 2006]

A reaction was found to be second order with respect to concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will [AIEEE 2006]

Rate of a reaction can be expressed by Arrhenius equation as:

k = Ae^–E/RT

In this equation, E represents [AIEEE 2006]

The following mechanism has been proposed for the reaction of NO and Br₂ to form NOBr

NO(g) + Br₂(g)  NOBr₂(g)

NOBr₂ (g) + NO(g) → 2NOBr(g)

If the second step is rate determining step, the order of the reaction with respect to NO(g) is [AIEEE 2006]

For the reaction A + B → C, it is found that doubling the concentration of A increases the rate by 4 times, and doubling the concentration of B doubles the reaction rate. What is the overall order of the reaction? [Karnataka CET 2005]

Which of these does not influence the rate of reaction? [Karnataka CET 2005]