Chemical Kinetics — practice questions

90 curated practice questions from Chemical Kinetics (Chemistry NEET, NTA Exams) — 26 hard, 43 easy, 21 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.

• The rate constant for a first order reaction is 4.606 10^ -3 5^ -1 . The time required to reduce 2.0 g of the reactant…
• Half-life of a substance A following first order kinetics is 5 days. Starting with 100 g of A, amount left after 15…
• A catalyst decrease the E a from 100 kJ mol -1 to 80 kJ mol -1 . At what temperature the rate of reaction in the…
• For a reaction of the type aA + bB → Products, the - d[A] d t is equal to:
• For the reaction, N _ 2 O _ 5 ( ~g ) 2 NO _ 2 ( ~g )+ 1 2 O _ 2 ( ~g ) the value of rate of disappearance of N 2 O 5 is…
• For a reaction, activation energy E a = 0 and the rate constant at 200 K is 1.6 10^ 5 5^ -1 . The rate constant at 400…
• The half-life for a zero order reaction having 0.02 M initial concentration of reactant is 100. The rate constant (in…
• The concentration of a reactant X decreases from 0.1 M to 0.005 M in 40 minutes. If the reaction follows 1 order…
• The bromination of acetone that occurs in acid solution is represented by this equation. CH 3 COCH 3 (aq) + Br 2 (aq) ⟶…
• If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction…
• Chemical reactions with very high E a values are generally?
• For a certain reaction, the rate = k[A] 2 [B], when the initial concentration of A is tripled keeping concentration of…
• t 1 /4 can be taken as the time taken for the concentration of a reaction to drop to 3/4 of its initial value. If the…
• If the concentration of a reactant decreases from 800 mol dm -3 to 50 mol dm -3 in 2 × 10 -5 s in a first order…
• The conversion of A to B follows second order kinetics. Doubling the concentration of A will increase the rate of…
• For the reaction, N 2 + 3H 2 → 2NH 3 , if d [ NH _ 3 ] d t =2 10^ -4 ~mol ~L ^ -1 5^ -1 . the value of - d [ H _ 2 ] dt…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• Under the same reaction conditions, initial concentration of 1.386 mol dm -3 of a substance becomes half in 40 seconds…
• The stoichiometric equation for the oxidation of bromide ions by hydrogen peroxide in acidic solution is ZBr ^ - + H _…
• H 2 gas is absorbed on the metal surface like tungsten. This follows.....order reaction.
• The rate of a first order reaction is 1.5 × 10 -2 mol L -1 min -1 at 0.5M concentration of the reactant. The half-life…
• Consider the reaction: N 2 (g) + 3H 2 (g) → 2NH 3 (g) The equality relationship between d [ NH _ 3 ] d t and - d [ H _…
• The rate of a chemical reaction doubles for every 10 ° C rise of temperature. If the temperature is raised by 50°C, the…
• R - COOR ^ + H _ 2 O R - COOH + R ^ OH What type of reaction is this?
• A chemical reaction was carried out at 300 K and 280 K. The rate constants were found to be K 1 and K 2 respectively…
• The velocity constant of a reaction at 290 K was found to be 3.2 × 10 -3 s -1 . When the temperature is raised to 310…
• If the volume of the vessel in which the reaction ZNO + O _ 2 2 NO _ 2 is occurring is diminished to 1 3 rd of its…
• The time for half-life period of a certain reaction A → Products is 1 hour. When the initial concentration of the…
• The rate equation for the reaction 2A + B → C is found to be rate = k [A] [B]. The correct statement in relation to…
• For a reaction 1 2 ~A ZB , rate of disappearance of 'A' is related to the rate of appearance of 'B' by the expression:
• The value of rate constant for a reaction is 10 -5 at 25°C and 10 -5 % molecules can cross the energy barrier at this…
• In the reaction, BrO _ 3 ^ - ( aq )+5 Br ^ - ( aq .)+6 H ^ + 3 Br _ 2 (n)+3 H _ 2 O (n) The rate of appearance of…
• The inversion of cane sugar using excess water in the presence of acid catalyst is a reaction of:
• The order of a reaction with rate equal to kC _ A ^ 3 / 2 C _ B ^ -1 / 2 is:
• In the reaction 3A → 2B, rate of reaction + d[G] d t is equal to?
• The rate of reaction between two reactants A and B decreases by a factor of 4, if the concentration of reactant B is…
• Rate of a reaction can be expressed by Arrhenius equation as: k=A e^ - E R T In this equation, E represents:
• Consider the given plots for a reaction obeying Arrhenius equation (0°C < T < 300°C) : (k and E a are rate constant and…
• The concentration of a reactant X decreases from 0.1 M to 0.005 M in 40 min. If the reaction follows first order…
• A first order reaction has a rate constant of 2.303 10^ -3 5^ -1 . The time required for 40 g of this reactant to…
• The rate law for a reaction between the substances A and B is given by rate = [A] n [B] m . On doubling the…
• For a reversible chemical reaction where the forward process is exothermic, which of the following statement is correct?
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• If a reaction follows the Arrhenius equation, the plot ln k vs 1 ( RT ) gives straight line with a gradient (-y) unit…
• Temperature coefficient of a reaction is 2. When temperature is increased from 30 ° C to 100°C , rate of the reaction…
• For a first order reaction A → B, the reaction rate at reactant concentration of 0.01 M is found to be 2.0 x 10 -5 mol…
• For a reaction A + 2B → C, rate is given by + d[C] d t =k[A][B] hence the order of the reaction is:
• For a reaction A + B → C + D, if the concentration of A is increased two times without altering the concentration of B…
• For the reaction system, 2 NO ( ~g )+ O _ 2 ( ~g ) 2 NO _ 2 ( ~g ) volume is suddenly reduced to half its value by…
• For the reaction A + B → C, it is found that doubling the concentration of A increases the rate by 4 times, and…
• For the reaction 2A + B → C, the values of initial rate at different reactant concentrations are given in the table…
• For the reaction, 2A + B → products, when the concentrations A and B both were doubled, the rate of the reaction…
• A catalyst lowers the activation energy of a reaction from 20 kJ mol -1 to 10 kJ mol -1 . The temperature at which the…
• During the kinetic study of the reaction, 2A + B → C + D, following results were obtained Run [A] / mol L -1 [B] / mol…
• The decomposition of phosphine (PH 3 ) on tungsten at low pressure is first-order reaction. It is because the
• The half-life period of a first order chemical reaction is 6.93 min. The time required for the completion of 99% of the…
• Half-life period of a first order reaction is 1386 s. The specific rate constant of the reaction is:
• If 60% of a first order reaction was completed in 60 min, 50% of the same reaction would be completed in approximately:
• The reaction, x F^ 2 follows the first order kinetics. In 40 minutes, the concentration of X changes from 0.1 M to…
• The energies of activation for forward and reverse reactions for A_ 2 +B_ 2 2 A B are 180 kJ mol -1 and 200 kJ mol -1…
• The rate law for the reaction, ZH _ 2 ( ~g )+ ZNO ( ~g ) N _ 2 ( ~g )+ ZH _ 2 O ( ~g ) is experimentally found out to…
• For the reaction H 2 + I 2 → 2HI, the differential rate law is:
• The correct options for the rate law that corresponds to overall first order reaction is
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• When initial concentration of the reactant is doubled, the half-life period of a zero order reaction
• The rate law for a reaction between the substances A and B is given by rate = k [A] n [B] m . On doubling the…
• The activation energy for a reaction at the temperature T K was found to be 2.303 RT J mol -1 . The ratio of the rate…
• The activation energy for a simple chemical reaction A → B is E a in forward direction. The activation energy for…
• Consider an endothermic reaction X → Y with the activation energies E b and E f for the backward and forward reactions…
• For the reaction 2A + B → 3C + D which of the following does not express the reaction rate?
• For a given reaction t_ 1 / 2 = 1 ka . The order of the reaction is:
• The half-life of a reaction is halved as the initial concentration of the reactant is doubled. The order of the…
• A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of…
• How will the rate of reaction 250_ 2 + O _ 2 25 O _ 3 ( rate = k [5 O _ 2 ] [ O _ 2 ] ) be effected if volume of the…
• Gaseous cyclobutane isomerises to butadiene in a first order process which has a k value at 153°C of 3.3 × 10 -4 s -1 …
• NO 2 required for a reaction is produced by the decomposition of N 2 O 5 in CCl 4 as per the equation, 2 ~N _ 2 O _ 5 (…
• In collision theory of chemical reaction, Z AB represents
• The reaction, A → products, follows first order kinetics. In 45 min, the concentration of A changes from 0.1 M to…
• For the reaction A products, it is found that the rate of reaction increases by a factor of 6.25 when concentration of…
• 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…
• For the reaction, A + B → Products, it is observed that On doubling the initial concentration of A only, the rate of…
• Half-life of a reaction is found to be inversely proportional to the cube of initial concentration. The order of…
• For a reaction 3A → 2B, the average rate of appearance of B is given by [ B ] t . The correct relation between the…
• For a first order reaction A → P, the temperature (T) dependent rate constant (k) was found to follow the equation k=…
• The rate constants k 1 and k 2 for two different reactions are 10^ 15 e ^ -201617 and 10^ 15 e ^ -10116 / 7…
• For the chemical reaction N _ 2 ( ~g )+3 H _ 2 ( ~g ) 2 NH _ 3 ( ~g ) The correct option is:
• Consider the chemical reaction, N 2 (g) + 3H 2 (g) → 2NH 3 (g). The rate of this reaction can be expressed in terms of…
• Decomposition of X exhibits a rate constant of 0.05 g/year. How many years are required for the decomposition of 5 g of…
• The reaction 2X → B is a zeroth order reaction. If the initial concentration of X is 0.2 M, the half-life is 6h. When…
• The rate constant for the reaction, 2N 2 O 5 → 4NO 2 + O 2 is 3.0 × 10 -5 s -1 . If the rate is 2.40 × 10 -5 mol L -1 s…

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