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Chemical Kinetics — JEE Main & Advanced NSEC PYQs

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

42 questionsNSECSolutions on every page
1

For an elementary rearrangement reaction A P , the following data were recorded at 303 K , when [ P ]₀=0 : Set No. [ A ]₀ / mol L ⁻¹ Rate of conversion of A / mol L ⁻¹ ⁻¹ 1 0.340 0

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The kinetic data recorded at 278 K for the reaction NH ₄ ⁺(a q)+ NO ₂ ⁻(a q) N ₂(g)+2 H ₂ O (I) is Set No. [ NH ₄⁺ ] / M [ NO ₂⁻ ] / M Rate of reaction/ M s-1 1 0.24 0.10 7.2 10⁻⁶

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The reaction X + Y Z is first order with respect to X and second order with respect to Y . The initial rate of formation of Z = R mol ⁻ dm ^3 sec ⁻¹ when [ X ]₀ and [ Y ]₀ are 0.40

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For the reaction 5 Br ⁻( aq )+ BrO ₃⁻( aq )+6 H ⁺( aq ) 3 Br ₂( aq )+3 H ₂ O ( l ) the rate expression was found to be - d [ BrO ₃ ⁻ ] / dt = k [ Br ⁻ ] [ H ⁺ ]^2 [ BrO ₃ ⁻ ] Which

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For the reaction N ₂+3 H ₂ 2 NH ₃ , the rate expression is - d [ NH ₃ ] / dt = k [ H ₂ ] [ N ₂ ] The correct statement is- I. The reaction is not elementary. II. The reaction is of

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For a gaseous reaction, A + B Products, the energy of activation was found to be 2.27 ~kJ ~mol ⁻¹ at 273 K . The ratio of the rate constant (k) to the frequency factor (A) at 273 K

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A toxic element is to be removed from drinking water by adsorption on activated charcoal. At low concentrations, the rate constant for adsorption is 1.8 10⁻⁵ ~s ⁻¹ . The time requi

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About the energy level diagram given below, which of the following statement/s is/are correct? I. The reaction is of two steps and ' R ' is an intermediate II. The reaction is exot

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Which of the following statement/s is/are correct? I. Half-life is 50 % of the total time taken for the completion of a reaction II. Collision frequency (Z), which is the number of

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Gas phase reactions (i) and (ii) are of first and second order respectively aligned & 2 ~N ₂ O ₅ 4 NO ₂+ O ₂ (i) & 2 NO + O ₂ 2 NO ₂ (ii) aligned Under certain conditions, the rate

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The equilibrium constant K for the reversible reaction A=B is 2 10^3 at 350 K . The rate constants of the forward reaction in the presence and absence of a suitable catalyst at the

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A chemical reaction is carried out at two different temperatures T₁ and T₂ (T₂>T₁ ) and also with and without a catalyst. The statement that is correct among the following is

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Urea, CO ( NH ₂ )₂ , decomposes at 90^ C as CO ( NH ₂ )₂( aq ) NH ₄ ⁺( aq )+ OCN ⁻( aq ) Experimental data obtained for the reaction is given in the following plot From the graph i

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The following are the concentration vs time plots of the reactants and products represented by the reaction L ( ~g )+2 M ( ~g ) N ( ~g )+3 O ( ~g ) The curves that represent M ( g

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For an elementary dimerization reaction of the type 2 R R ₂ , the value of the steric factor was found to be 2.5 . This indicates that

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Viruses are nonliving complex chemical entities. They undergo inactivation and hence lose the ability to infect a host, with time. Concentration (expressed as 'median tissue cultur

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Initial concentrations of the reactants and the corresponding half-lives for the reaction P + Q R are given below. The rate law for the reaction is Entry [ P ₀ ] ( mol dm ⁻³ 10⁻⁶ )

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Following is a qualitative plot that can represent kinetic data obtained with a reactant R where [R]₀ and [R] represent the concentrations of R , at t=0 and t=t respectively. ' Y '

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The rate constant values for the decay of radioisotopes X and Y , used in radio-medicine are 0.05 ~h ⁻¹ and 0.025 ~h ⁻¹ respectively. In a hospital, at a time ' t ₀ ' the activity

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Which of the energy values marked as I,II and III in the following diagram, will change by the addition of a suitable catalyst?

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The rate of the reaction between two reactants X and Y can be expressed as R = k [ X ]^2[ Y ] . In an experiment, the initial rate of the reaction was found to be R ₁ when the init

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A toxic element is to be removed from drinking water by adsorption on activated charcoal. At low concentrations, the rate constant for adsorption is 1.8 10⁻⁵ ~s ⁻¹ . The time requi

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For the reaction N ₂+3 H ₂ 2 NH ₃ , the rate expression is - d [ NH ₃ ] / dt = k [ H ₂ ] [ N ₂ ] The correct statement is- I. The reaction is not elementary. II. The reaction is of

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For an elementary rearrangement reaction A P , the following data were recorded at 303 K , when [ P ]₀=0 : Set No. [ A ]₀ / mol L ⁻¹ Rate of conversion of A / mol L ⁻¹ ⁻¹ 1 0.340 0

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The kinetic data recorded at 278 K for the reaction NH ₄ ⁺(a q)+ NO ₂ ⁻(a q) N ₂(g)+2 H ₂ O (I) is Set No. [ NH ₄⁺ ] / M [ NO ₂⁻ ] / M Rate of reaction/ M s-1 1 0.24 0.10 7.2 10⁻⁶

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For a gaseous reaction, A + B Products, the energy of activation was found to be 2.27 ~kJ ~mol ⁻¹ at 273 K . The ratio of the rate constant (k) to the frequency factor (A) at 273 K

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For the reaction 5 Br ⁻( aq )+ BrO ₃⁻( aq )+6 H ⁺( aq ) 3 Br ₂( aq )+3 H ₂ O ( l ) the rate expression was found to be - d [ BrO ₃ ⁻ ] / dt = k [ Br ⁻ ] [ H ⁺ ]^2 [ BrO ₃ ⁻ ] Which

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The reaction X + Y Z is first order with respect to X and second order with respect to Y . The initial rate of formation of Z = R mol ⁻ dm ^3 sec ⁻¹ when [ X ]₀ and [ Y ]₀ are 0.40

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Which of the energy values marked as I,II and III in the following diagram, will change by the addition of a suitable catalyst?

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The equilibrium constant K for the reversible reaction A=B is 2 10^3 at 350 K . The rate constants of the forward reaction in the presence and absence of a suitable catalyst at the

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Urea, CO ( NH ₂ )₂ , decomposes at 90^ C as CO ( NH ₂ )₂( aq ) NH ₄ ⁺( aq )+ OCN ⁻( aq ) Experimental data obtained for the reaction is given in the following plot From the graph i

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The rate of the reaction between two reactants X and Y can be expressed as R = k [ X ]^2[ Y ] . In an experiment, the initial rate of the reaction was found to be R ₁ when the init

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A chemical reaction is carried out at two different temperatures T₁ and T₂ (T₂>T₁ ) and also with and without a catalyst. The statement that is correct among the following is

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Gas phase reactions (i) and (ii) are of first and second order respectively aligned & 2 ~N ₂ O ₅ 4 NO ₂+ O ₂ (i) & 2 NO + O ₂ 2 NO ₂ (ii) aligned Under certain conditions, the rate

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About the energy level diagram given below, which of the following statement/s is/are correct? I. The reaction is of two steps and ' R ' is an intermediate II. The reaction is exot

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Which of the following statement/s is/are correct? I. Half-life is 50 % of the total time taken for the completion of a reaction II. Collision frequency (Z), which is the number of

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Viruses are nonliving complex chemical entities. They undergo inactivation and hence lose the ability to infect a host, with time. Concentration (expressed as 'median tissue cultur

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Initial concentrations of the reactants and the corresponding half-lives for the reaction P + Q R are given below. The rate law for the reaction is Entry [ P ₀ ] ( mol dm ⁻³ 10⁻⁶ )

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Following is a qualitative plot that can represent kinetic data obtained with a reactant R where [R]₀ and [R] represent the concentrations of R , at t=0 and t=t respectively. ' Y '

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The following are the concentration vs time plots of the reactants and products represented by the reaction L ( ~g )+2 M ( ~g ) N ( ~g )+3 O ( ~g ) The curves that represent M ( g

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The rate constant values for the decay of radioisotopes X and Y , used in radio-medicine are 0.05 ~h ⁻¹ and 0.025 ~h ⁻¹ respectively. In a hospital, at a time ' t ₀ ' the activity

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For an elementary dimerization reaction of the type 2 R R ₂ , the value of the steric factor was found to be 2.5 . This indicates that

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