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Chemical Kinetics — BITSAT Chemistry PYQs

33 previous year questions from Chemical Kinetics with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

Chemical Kinetics — BITSAT Chemistry PYQs

For the reaction 2 SO ₂+ O ₂ 2 SO ₃ , the rate of disappearance of O ₂ is 2 10⁻⁴ ~mol ~L ⁻¹ s ⁻¹ . The rate appearance of SO ₃ is

If for a first order reaction, the value of A and E_a are 4 10¹³ ~s ⁻¹ and 98.6 ~kJ ~mol ⁻¹ respectively, then at what temperature will its half life period be 10 minutes?

In the chemical reaction A B , what is the order of the reaction? Given that, the rate of reaction doubles if the concentration of A is increased four times.

Calculate the activation energy of a reaction, whose rate constant doubles on raising the temperature from 300 K to 600 K .

In the reaction, A products, If the concentration of the reactant is doubled rate of the reaction remains unchanged. The order of the reaction with respect to A is

In a first order reaction, the concentration of the reactant, decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is

For the decomposition of azomethane, CH ₃ ~N ₂ CH ₃( ~g ) CH ₃ CH ₃( ~g )+ N ₂( ~g ) a first order reaction, the variation in partial pressure with time at 600 ~K is given as The h

Plots showing the variation of the rate constant (k) with temperature (T) are given below. The plot that follows Arrhenius equation is

In a 1 st order reaction, reactant concentration C varies with time t as :

XmL of H ₂ gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical conditions is :

A radioactive isotope having a half - life period of 3 days was received after 12 days. If 3 ~g of the isotope is left in the container, what would be the initial mass of the isoto

Given the hypothetical reaction mechanism A &#10230; I B &#10230; II C &#10230; III D &#8594; IV E and the rate as Species formed Rate of its information B 0 . 002 mol / h per mole

For the chemical reaction 2 O 3 &#10230; 3 O 2 , the reaction proceeds as follows O 3 &#8652; O 2 + O (Fast) O + O 3 &#10230; 2 O 2 , (Slow) the rate law expression should be given

For a reversible reaction, A &#8652; B , which one of the following statement is wrong from the given energy profile diagram?

Under the same reaction conditions, initial concentration of 1 . 386 mol dm - 3 of a substance becomes half in 40 s and 20 s through first order and zero order kinetics, respective

The rate of a reaction triples when temperature changes from 20 0 C to 50 0 C . The energy of activation for the reaction is R = 8 . 314 JK - 1 mol - 1

Which of the following expression is correct for the rate of reaction given below ? 5 Br - aq + BrO 3 - aq + 6 H + aq &#10230; 3 Br 2 aq + 3 H 2 O l

For an endothermic reaction, where &#916;H represent the enthalpy of reaction in kJ mol - 1 , the minimum value for energy of activation (for forward reaction) will be

A graph is plotted between log K versus 1 T for calculation of activation energy E a . The correct plot is

Consider the reaction : Cl ₂(a q)+ H ₂ ~S (a q) S (s)+2 H ⁺(a q)+2 Cl ⁻(a q) The rate equation for this reaction is rate =k [ Cl ₂ ] [ H ₂ ~S ] Which of these mechanisms is/are con

In the reaction, P + Q ? R + S The time taken for 75 % reaction of P is twice the time taken for 50 % reaction of P . The concentration of Q varies with reaction time as shown in t

The unit of rate constant for reactions of second order is

In a first order reaction with time the concentration of the reactant decreases

The reduction of peroxydisulphate ion by I ion is expressed by S ₂ O ₈²⁻+3 I ⁻ 2 SO ₄²⁻+ I ₃⁻ . If rate of disappearance of I ⁻ is 9 / 2 10⁻³ ~mol lit ⁻¹ s ⁻¹, what is the rate of

A gaseous reaction X ₂( ~g ) Y + 1 2 Z ( g ) There is increase in pressure from 100 ~mm to 120 mm in 5 minutes. The rate of disappearance of X ₂ is

Two substances R and S decompose in solution independently, both following first order kinetics. The rate constant of R is twice that of S . In an experiment, the solution initiall

Velocity constant of a reaction at 290 ~K was found to be 3.2 10⁻³ . At 300 ~K it will be

At high pressure, the entire surface gets covered by a monomolecular layer of the gas follows

2 ~N ₂ O ₅ 4 NO ₂+ O ₂ If rate and rate constant for above reaction are 2.40 10⁻⁵ ~mol ~L ⁻¹ ~s ⁻¹ and 3 10⁻⁵ ~s ⁻¹ respectively, then calculate the concentration of N ₂ O ₅

During the kinetic study of the reaction, 2 ~A + B C + D , following results were obtained: array |c|c|c|c| Run & [ A ] / mol L ⁻¹ & [ ~B ] / mol L ⁻¹ & array l Initial rate of for

The activation energy for a simple chemical reaction A B is E_ a in forward direction. The activation energy for reverse reaction

The following data are for the decomposition of ammonium nitrite in aqueous solution : The order of reaction is:

The chemical reaction 2 O ₃ 3 O ₂ proceeds as follows: rate law expression should be:

Given the hypothetical reaction mechanism A ⟶ I B ⟶ II C ⟶ III D → IV E and the rate as Species formed Rate of its information B 0 . 002 mol / h per mole

For the chemical reaction 2 O 3 ⟶ 3 O 2 , the reaction proceeds as follows O 3 ⇌ O 2 + O (Fast) O + O 3 ⟶ 2 O 2 , (Slow) the rate law expression should be given

For a reversible reaction, A ⇌ B , which one of the following statement is wrong from the given energy profile diagram?

Which of the following expression is correct for the rate of reaction given below ? 5 Br - aq + BrO 3 - aq + 6 H + aq ⟶ 3 Br 2 aq + 3 H 2 O l

For an endothermic reaction, where ΔH represent the enthalpy of reaction in kJ mol - 1 , the minimum value for energy of activation (for forward reaction) will be