Chemical Kinetics — practice questions
101 curated practice questions from Chemical Kinetics (Chemistry JEE Main, NTA Exams) — 73 easy, 16 hard, 12 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.
- The rate of a reaction is expressed in different ways as follows : + 1 2 ~d [ C ] dt =- 1 3 ~d [ D ] dt =+ 1 4 ~d [ ~A…
- Which one is correct for k = A ^ - E _ a / R ?
- The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction…
- The rate of reaction is doubled for every 10ºC rise in temperature. The increase in rate as result of increase in…
- For the two gaseous reactions, following data are given A ~B ; k _ 1 =10^ 10 e ^ -20,000 / T C D ; k _ 2 =10^ 12 e ^…
- For the reaction, 3A + 2B → C + D The differential rate law can be written as :
- Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- For the reaction A + E product doubling the initial concentration of both the reactants increases the rate by a factor…
- In the respect of the equation k = A e^ -E a / R T in chemical kinetics, which one of the following statements is…
- Half life of a chemical reaction at a particular concentration is 50 min. When the concentration of the reactant is…
- In a first order reaction, the conc. of reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the…
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: Catalyst…
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: In rate…
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: Rate of…
- The following mechanism has been proposed for the reaction of NO with Br 2 to form NOBr, array l NO ( ~g )+ Br _ 2 ( ~g…
- In a closed vessel, ozone transforms into oxygen through two steps as mentioned below: O_ 3 O_ 2 +O( fast ) O + O _ 3 2…
- A student has studied the decomposition of a gas A B_ 3 at 25°C. He obtained the following data. p (mm Hg) 50 100 200…
- For an elementary chemical reaction, A_ 2 k_ -1 k_ 1 2 A , the expression for d[A] d t is:
- The chemical reaction, 2 O _ 3 3 O _ 2 proceeds as O _ 3 O _ 2 +[ O ] (fast) [ O ]+ O _ 3 2 O _ 2 (slow) The rate law…
- The rate constant of a reaction is given by lnk (sec –1 ) = 14.34 – (1.25 × 10 4 )/T What will be the energy of…
- The specific rate constant of a first order reaction depends on the:
- The rate constant of a reaction is 2.5 × 10 –2 minutes –1 . The order of the reaction is
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: Two…
- For the first order reaction A → Products, which one of the following is the correct plot of log [A] versus ‘t’ time ?
- For a single step reaction ; A + 2 B → Products, the molecularity is
- The differential rate law for the reaction H 2 + I 2 ⇌ 2HI is
- The thermal decomposition of acetaldehyde: CH _ 3 CHO CH _ 4 + CO _ 4 has rate constant of 1.8 × 10 -3 mole -1/2 L 1 /2…
- The time for half-life period of a certain reaction, A → products is 1 h. When the initial concentration of the…
- For the decomposition of a compound AB at 600 K, the following data were obtained [AB] mol dm -3 Rate of decomposition…
- The rate law for a reaction between the substance A and B is given by rate = k [A] n [B] m . On doubling the…
- The rate of formation of ammonia by the reaction : N 2 + 3 H 2 → 2 NH 3 expressed as d [ NH _ 3 ] dt = 2.5 × 10 –4 mol…
- The correct expression for the rate constant for reactions of zero order is
- The rate of a chemical reaction generally increases rapidly even for small temperature rise because of rapid increases…
- The following data were obtained during the first order thermal decomposition of SO 2 Cl 2 at a constant volume. SO _ 2…
- For the reaction CH 3 COCH 3 + I 2 H ^ + Products, the rate is governed by the expression dx dt = k [Acetone] [H + ]…
- For a first order reaction; which of the following statement is correct:
- In the reaction 2 A + B → Products, the order w.r.t. A is found to be one and w.r.t. B equal to 2 . Concentration of A…
- The rate of reaction A + B + C → Products is given by Rate = k [A] 1/2 [B] 1/3 [C] The order of the reaction is :
- The rate of uncatalysed reaction at 127°C is equal to that of the catalysed reaction at 27°C. This means catalyst…
- The rate of a reaction 2X + Y → Products is given by d [ Y ] dt = k [X] 2 [Y] if X is present in large excess, then…
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1 …
- a A+b B P ; d x d t =K[A]^ a [B]^ a . If concentration of A is doubled, rate is doubled. If concentration of B is…
- For a reaction K _ 1 ~A ~B C , If the rate of formation of B is set to be zero then the concentration of B is given by…
- Consider the reaction: Cl _ 2 ( aq )+ H _ 2 5( aq ) 5(5)+2 H ^ + ( aq )+2 Cl ^ - ( aq ) The rate equation for this…
- The rates of reactions increase with increase of temperature because
- For the reaction A + B → C + D, doubling the concentration of both the reactants increases the reaction rate by 8 time…
- The reaction A ( ~g )+ Z ~B ( ~g ) C ( ~g )+ D ( ~g ) is an elementary process. In an experiment, the initial partial…
- The rate of a chemical reaction doubles for every 10ºC rise of temperature. If the temperature is raised by 50ºC, the…
- For a chemical reaction A + B → Product, the order is 1 with respect to A and B. Rate mol L –1 S –1 [A] mol L –1 [B]…
- 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)…
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
- The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of…
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: Ionic…
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1: The…
- The rate constant for the first and zero order reaction in terms of molarity, M units respectively
- The rate coefficient (k) for a particular reactions is 1.3 × 10 –4 M –1 s –1 at 100 0 C, and 1.3 ×10 –3 M –1 s –1 at…
- Iron(III) catalyses the reaction between iodide and persulphate ions, in which (A) Fe 3+ oxidises the iodide ion (B) Fe…
- The following results were obtained during kinetic studies of the reaction: 2A + B → Products Experiment [A] (in mol L…
- The half life period of a first order reaction is 15 minutes. The amount of substance left after one hour will be:
- For a reaction, A + 2B → C rate is given by R = k [A] [B] 2 . The order of reaction is
- Which one of the following statements is incorrect about the molecularity of a reaction ?
- For a chemical reaction A → B, the rate of the reaction is 2 x 10 -3 mol dm -3 s -1 , when the initial concentration is…
- In a 1st order reaction the fraction of molecules at 450ºC having sufficient energy (or fraction of effective…
- For a reaction pA + qB → products, the rate law expression is r = k [A] m [B] n then
- The energies of activation for forward and reverse reaction for A 2 + B 2 ⇌ 2AB are 180 kJ mol –1 and 200 kJ mol –1…
- Which one of the following formula represents the first order reaction ?
- In a reaction A → B threshold energy of the reactant is 120 kJ mole –1 and the normal energy of the reactant is 20 kJ…
- The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction…
- For a reaction 1 2 ~A 2 ~B rate of disappearance of ‘A’ is related to the rate of appearance of ‘B’ by the expression
- According to collision theory of reaction rates, the rate of reaction depends
- For the reaction. 2 HI → H 2 + I 2 , the expression - 1 2 ~d [ H ] t represents
- The rate equation for the reaction, 2A + B → C is found to be : rate = k [A] [B]. The correct statement in relation to…
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
- For a reaction 2 NH _ 3 ~N _ 2 +3 H _ 2 it is observed that, - d [N H_ 3 ] d t =k_ 1 [N H_ 3 ] d [H_ 2 ] d t =k_ 3 [N_…
- The temperature dependence of the rate constant k is expressed as k = Ae ^ - E _ a / RT . When a plot between logk and…
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT-1…
- A reactant (A) forms two products A k _ 1 B, Activation energy E_ a_ 1 A k _ 2 C, Activation energy E _ a _ 2 If E _ a…
- For a reaction X + Y → Z, rate [X]. What is (i) molecularity and (ii) order of reaction ?
- A hypothetical reaction, follows the mechanism: (fast equilibrium) (slow) Then the order of reaction is:
- Consider the following reaction that goes from A to B in three steps as shown below: Choose the correct option (Jee…
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: The…
- For a general reaction X Y, the plot of conc. of X vs time is given in the figure. What is the order of the reaction…
- Which of the following represents the expression for 3/4th life of a first order reaction
- For the reaction 2A + B → D + E the following mechanism has been proposed : A + B → C + D (slow) A + C → E (fast) The…
- For the gaseous reaction 2A + B → C + D, the rate is given by k [A] [B]. The volume of the container containing the…
- A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of…
- Rate of a reaction can be expressed by Arrhenius equation as k = A e –E/RT In this equation, E represents
- At 30°C, the half life for the decomposition of AB 2 is 200 s and is independent of the initial concentration of AB 2 …
- The rate of reaction increases with increase of temperature because
- Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. Assertion: The…
- For a first order reaction, (A) product the concentration of A changes from 0.1 M to 0.025 M in 40 min. The rate of…
- For a reaction, 2 NO +2 H _ 2 ~N _ 2 +2 H _ 2 O the possible mechanism is 2 NO ~N _ 2 O _ 2 N _ 2 O _ 2 + H _ 2 slow N…
- In the reaction of formation of sulphur trioxide by contact process 2SO 2 +O 2 ⇌ 2SO 3 the rate of reaction was…
- Integrated rate law equation for a first order gas phase reaction is given by (where P i is initial pressure and P t is…
- For a first order reaction the time required for completion of 90% reaction is 'x’ times the half life of the reaction…
- The activation energy for a reaction is 9.0 Kcal/mol. The increase in the rate constant when temperature is increased…
- For the reaction, 2 ~N _ 2 O _ 5 4 NO _ 2 + O _ 2 , the rate equation can be expressed in two ways – d [ ~N _ 2 O _ 5 ]…
- Consider the reaction, Cl 2 (aq) + H 2 S (aq) → S (s) + 2H + (aq) + 2Cl – (aq) The rate equation for this reaction is…
- In a reaction carried out at 500 K, 0.001% of the total numbers of collisions are effective. The energy of activation…
- Consider following two reactions array l A Product _ 1 - d[A] d t =k_ 1 [A]^ a B Product _ 1 - d[B] d t =k_ 2 [B] array…
- If ‘a’ is the initial concentration of the reactant, the time taken for completion of the reaction, if it is of zero…