Chemical Kinetics — practice questions
113 curated practice questions from Chemical Kinetics (Chemistry JEE Advanced, NTA Exams) — 96 hard, 17 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.
- The rate law expression for the hypothetical reaction 2 A + 3 B → 2 C is dx dt = k [A] [B] 2 The order of reaction is
- Concentrations measured as a function of time when gaseous N 2 O 5 at initial concentration of 0.0200 M decomposes to…
- The rate constant for the reaction 2N 2 O 5 → 4NO 2 + O 2 is 3.0 × 10 –5 sec –1 If the rate is 2.4×10 –5 mol L –1 sec…
- If E f and E r are the activation energies of the forward and reverse reactions and the reaction is known to be…
- The half-life a first order reaction is 24 hours. If we start with 10M initial concentration of the reactant then conc…
- A reaction involves two reactants. The rate of reaction is directly proportional to the concentration of one of them…
- For the hypothetical reaction A 2 + B 2 ⟶ 2AB, the mechanism is given as below A 2 A + A(fast reaction) A + B 2 ⟶ AB +…
- The dependence of rate on concentrations of reactants is expressed in terms of rate law, which is established…
- Plots showing the variation of the rate constant (k) with temperature (T) are given below. The plot that follows…
- The activation energy of a reaction is zero. The rate constant of the reaction
- The reaction, X → Product, follows first order kinetics. In 40 minutes the concentration of X changes from 0.1 to 0.025…
- Concentrations measured as a function of time when gaseous N 2 O 5 at initial concentration of 0.0200 M decomposes to…
- Which of the following plots is(are) correct for the given reaction? ([ P ] 0 is the initial concentration of P )
- The rate of reaction between A and B increases by a factor of 100, when the concentration of A is changed from 0.1 mol…
- A sample of rock from the moon contains equal number of atoms of U and Pb (t ½ for uranium = 4.5×10 9 years). The age…
- The reaction, X → Product, follows first order kinetics. In 40 minutes the concentration of X changes from 0.1 to 0.025…
- The thermal decomposition of A → B + C has rate constant x mole –1/2 lit 1/2 min –1 at a given temperature. How would …
- If a reaction A + B → C is exothermic to the extent of 30 kJ/mol and the forward reaction has an activation energy 70…
- The rate law for the reaction: R Cl + NaOH ( aq ) → R OH + NaCl is given by, Rate = k [ R Cl]. The rate of the reaction…
- The rate constant of a reaction has same units as the rate of reaction. The reaction is of
- t 1/4 can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its initial value. If the…
- In a first order reaction the concentration of reactant decreases from 800 mol/dm 3 to 50 mol/dm 3 in 2 × 10 4 sec. The…
- For the reaction A + B → C + D, the variation of the concentration of the product with time is given by the curve.
- For a first order reaction P (g) → Q (g) + R (g) . After 10 minutes the volume of R gas is 10 L and after complete…
- According to the collision model of kinetics, certain activation energy must be overcome before a reaction can proceed…
- Consider a reaction aG + bH → Products. When concentration of both the reactants G and H is doubled, the rate increases…
- The following mechanism has been proposed for the reaction of NO with Br 2 to form NOBr NO(g) + Br 2 (g) ⇌ NOBr 2 (g)…
- For the elementary reaction M → N , the rate of disappearance of M increases by a factor of 8 upon doubling the…
- For a first order reaction A ( ~g ) 2 ~B ( ~g )+ C ( ~g ) at constant volume and 300 K, the total pressure at the…
- The half-life period of a radioactive element is 120 days. Starting with 1 gm, the amount of element decayed in 600…
- An increase in the rate of reaction with rise in temperature is due to
- The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation k = Ae…
- Plots showing the variation of the rate constant ( k ) with temperature ( T ) are given below. The plot that follows…
- Carbon-14 is used to determine the age of organic material. The procedure is based on the formation of ^ 14 C by…
- In the sequence of reaction A k _ 1 ~B k _ 2 C k _ 3 D k 3 > k 2 > k 1 , then the rate determining step of the reaction…
- Estrification of acetic anhydride by ethanol takes place as (CH 3 CO) 2 O + C 2 H 5 OH → CH 3 COOC 2 H 5 + CH 3 COOH…
- The rate constant for a zero order reaction is 2 × 10 –2 mol L –1 sec –1 . If the concentration of the reactant after…
- A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity…
- In the accompanied diagram, E R , E P and E X represent the energy of the reactants, products and activated complex…
- 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…
- Carbon-14 is used to determine the age of organic material. The procedure is based on the formation of ^ 14 C by…
- Milk turns sour at 40ºC three times faster at 0ºC. Hence Ea in calories of turning of milk sour is
- Asseration (A): If the activation energy of a reaction is zero, temperature will have no effect on the rate constant…
- For the reaction A + B → C, it found that doubling the concentration of A increases the rate by 4 times, and doubling…
- Consider a reaction aG + bH → products. When concentration of both the reactants G and H is doubled, the rate increases…
- Assertion (A): According to steady state hypothesis, in a multistep reaction, the change in concentration with time for…
- In a bimolecular reaction, the steric factor P was experimentaly determined to be 4.5 . the correct option(s) among the…
- Four vessels 1, 2, 3 and 4 contain respectively, 10 mol atom (t 1/2 = 10 hours), 1mol atom (t 1/2 = 5 hours), 5 mol…
- Under the same reaction conditions, initial concentration of 1.386 mol dm –3 of a substance becomes half in 40 seconds…
- Under a given set of experimental conditions, with increase of concentration of the reactants, the rate of a chemical…
- The rate constant for the reaction, 2N 2 O 5 → 4NO 2 + O 2 , is 3.0 × 10 –5 sec –1 . If the rate is 2.40 × 10 –5 mol…
- Two gases A and B are filled in a container. The experimental rate law for the reaction between them, has been found to…
- The rate constant, the activation energy and the Arrhenius parameter of a chemical reaction at 25 °C are 3.0×10 –4 s –1…
- Consider an endothermic reaction X → Y with the activation energies E b and E f for the backward and forward reactions…
- The rate constant for the reaction 2N 2 O 5 → 4NO 2 + O 2 , is 3.0 × 10 –5 sec –1 . If the rate is 2.40 × 10 –5 mol…
- The rate law of gaseous reaction : A (g) + B (g) → Products is given by k[A] 2 [B]. If the volume of the reaction…
- Assertion (A): For the 2N 2 O 5 → 4NO 2 + O 2 ; Rate = K[N 2 O 5 ]. Reason (R): Rate of decomposition of N 2 O 5 is…
- The ratio of the rate constant of a reaction at any temperature T to the rate constant T → ∞ is equal to
- The half-life period for a reaction at initial concentrations of 0.5 and 1.0 mol lit –1 are 200 sec and 100 sec…
- If I is the intensity of absorbed light and C is the concentration of AB for the photochemical process, AB + h u → AB …
- An endothermic reaction A → B has an activation energy as x kJ mol –1 of A. If energy change of the reaction is y kJ…
- For the elementary reaction M → N, the rate of disappearance of M increases by a factor of 8 upon doubling the…
- For a first order reaction A → P, the temperature (T) dependent rate constant (k) was found to follow the equation …
- Asseration (A): If in a zero order reaction, the concentration of the reactant is doubled, the half-life period is also…
- In the presence of acid, the initial concentration of cane-sugar was reduced from 0.2 M to 0.1 M in 5 hrs and to 0.05 M…
- Which of the following plots is(are) correct for the given reaction? ([ P ]_ 0 . is the initial concentration of P)…
- SO 2 C l 2 ⇌ SO 2 + C l 2 is the first order as gas reaction with k = 2.2 × 10 –5 sec –1 at 320ºC. The percentage of SO…
- The chemical reaction, 2O 3 → 3O 2 proceeds as follows O 3 ⇌ O 2 + O (Fast) O + O 3 → 2O 2 (slow) The rate law…
- This question contains statement-1 (assertion) and statement-2 (reason). Of these statements, mark correct choice if…
- When concentration of reactant in reaction A → B is increased by 9 times, the rate increases only 3 times. The order of…
- The thermal decomposition of acetaldehyde : CH 3 CHO → CH 4 + CO, has rate constant of 1.8 × 10 –3 mole –1/2 L 1/2 min…
- The equilibrium constant of reaction is 20.0 At equilibrium, the rate constant of forward reaction is 10.0. The rate…
- The rate constant of a reaction at 27ºC is 2.3 × 10 –3 min –1 and at this temperature 0.002% of the reactant molecules…
- The rate constant of a reaction A → B + C at 27ºC is 3.0 × 10 –5 s –1 and at this temperature 1.5 × 10 –4 percent of…
- The specific rate constant of a first order reaction depends on the
- Hydrolysis of a sugar is catalysed by H + ion. Half-life of the reaction is independent of initial concentration of…
- What is the order of a reaction which has a rate expression rate = k [A] 3/2 [B] –1 ?
- The decomposition of ozone is believed to occur by the mechanism : O 3 ⇌ O 2 + O (fast) O + O 3 → O 2 (slow) When the…
- For the reaction A + 2B → C, the rate of reaction at a given instant can be represented by
- Under the same reaction conditions, initial concentration of 1.386 mol dm –3 of a substance becomes half in 40 s and 20…
- When the temperature of a reaction is changed from T 1 to T 2 half-life is found to decrease. Thus :
- For the reaction CH 3 Cl (aq) + OH – (aq) ⇌ CH 3 OH (aq) + C l – (aq) The kinetic data are as given below : [CH 3 Cl]…
- For an endothermic reaction, where ∆H represents the enthalpy of reaction in kJ mol, the minimum value for the energy…
- E a and ∆H values of reactions R 1 , R 2 , R 3 and R 4 carried out at the same temperature are as given below : R 1 E a…
- The dependence of rate on concentrations of reactants is expressed in terms of rate law, which is established…
- The dependence of rate on concentrations of reactants is expressed in terms of rate law, which is established…
- Consider the chemical reaction, N 2 ( g ) + 3H 2 ( g ) → 2NH 3 ( g ) . The rate of this reaction can be expressed in…
- 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 …
- For the decomposition of N 2 O 5 at a particular Temperature according to the equations 2N 2 O 5 → 4NO 2 + O 2 N 2 O 5…
- If ‘I’ is the intensity of absorbed light and ‘C’ is the concentration of AB for the photochemical process, AB + hv ⟶…
- In the decay sequence, _ 92 ^ 238 U - xl _ 90 ^ 234 Th - x 2 _ 91 ^ 234 ~Pa - x 3 ^ 234 Z - x _ 4 _ 90 ^ 230 Th x 1 , x…
- The rate of a reaction at different times (- d d ) is found as follows : Time (in minute) Rate in (mol L –1 s –1 ) 0…
- In the decomposition of Ammonia it was found that at 50 torr pressure T 1/2 was 3.64 hour while at 100 torr T 1/2 was…
- For the reaction 4 A + B → 2 C + 2D, which of the following statement is not correct ?
- The rate constant of a reaction is 2.1 × 10 –2 mol –2 litre 2 min –1 . The order of reaction is
- T 50 of first-order reaction is 10 min. Starting with 10 mol L –1 , rate after 20 min is (2008)
- Which one of the following statement for order of reaction is not correct ? (2005)
- For a first order reaction : A ⇌ B, Whose concentration vs. time curve is as shown in the figure. The rate constant is…
- For a given reaction half life period was found to be directly proportional to the initial concentration of the…
- Consider the reaction, 2A + B → products When concentration of B alone was doubled, the half-life did not change. When…
- Ag + NH 3 ⇌ [Ag(NH 3 ) + ] ; k 1 = 6.8 × 10 –3 [Ag(NH 3 )] + + NH 3 ⇌ [Ag(NH 3 ) 2 ] + ; k 2 = 1.6 × 10 –3 then the…
- Concentrations measured as a function of time when gaseous N 2 O 5 at initial concentration of 0.0200 M decomposes to…
- A hypothetical reaction A 2 + B 2 → 2 AB follows the mechanism as given below : A 2 ⇌ A + A (fast) A + B 2 → AB + B…
- When concentration of reactant in reaction A → B is increased by 8 times, the rate increases only 2 times. The order of…
- For the reaction, A → B, the rate of reaction is quadrupled when the concentration of A is doubled, the rate expression…
- Asseration (A): The rate of the reaction is the rate of change of concentration of a reactant or a product. Reason (R)…
- Which one of the following statemenst for order of reaction is not correct?
- For a first order reaction A → P , the temperature ( T ) dependent rate constant ( k ) was found to follow the equation…
- For the following reaction 2 X + Y k P the rate of reaction is d [ P ] dt = k [ X ] . Two moles of X are mixed with one…
- The half-life period of a radio active element is 30 min. One sixteenth the original quantity of the element will…
- Which of the following statements about the Arrhenius equation is/are correct ?
- Hydrolysis of an ester is catalysed by H + ion. Using equimolar concentrations of two acids HX and HY, both being…
- Carbon-14 is used to determine the age of organic material. The procedure is based on the formation of ^ 14 C by…