Chemical Kinetics — practice questions
90 curated practice questions from Chemical Kinetics (Chemistry Class 12, CBSE) — 89 easy, 1 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.
- Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction? (i) A…
- The rate of formation of a dimer in a second order dimerisation reaction is 9.1 × 10 –6 mol L –1 s –1 at 0.01 mol L –1…
- The increase in concentration of the reactants lead to change in
- The unit of rate constant for the reaction, 2H 2 + 2NO → 2H 2 O + N 2 which has rate = k [H 2 ][NO] 2 , is
- The value of rate of a pseudo first order reaction depends upon
- Half-life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?
- In a reaction 2 X → Y , the concentration of X decreases from 3.0 moles/litre to 2.0 moles/litre in 5 minutes. The rate…
- The hydrolysis of ethyl acetate, CH 3 COOC 2 H 5 + H 2 O CH 3 COOH + C 2 H 5 OH is a reaction of
- Fill up the following with suitable terms. (i) Activation energy = Threshold energy – ______ (ii) Half-life period of…
- The temperature dependence of the rate constant k is expressed as k = Ae – E a /RT . When a plot between log k and 1/ T…
- The decomposition of dimethyl ether is a fractional order reaction. The rate of reaction is given by rate = k ( p CH 3…
- The rate of disappearance of SO 2 in the reaction, 2SO 2 + O 2 → 2SO 3 is 1.28 × 10 –5 mol s –1 . The rate of…
- Consider the reaction, 2N 2 O 5 4NO 2 + O 2 . In the reaction NO 2 is being formed at the rate of 0.0125 mol L –1 s –1…
- For the reaction, 2N 2 O 5 → 4NO 2 + O 2 rate and rate constant are 1.02 × 10 –4 mol L –1 s –1 and 3.4 × 10 –5 s –1…
- The following data were obtained during the first order thermal decomposition of SO 2 Cl 2 at a constant volume. SO 2…
- A first order reaction is 20% complete in 10 minutes. What is the specific rate constant for the reaction?
- The half-life of the reaction X → Y , following first order kinetics, when the initial concentration of A is 0.01 mol L…
- For an endothermic reaction, Δ H represents the enthalpy of the reaction in kJ mol –1 . The minimum amount of…
- A reaction in which reactants ( R ) are converted into products ( P ) follows second order kinetics. If concentration…
- The expression to calculate time required for completion of zero order reaction is
- Under what conditions a bimolecular reaction may be kinetically of first order?
- The rate law for a reaction, A + B → C + D is given by the expression k [ A ]. The rate of reaction will be
- In a first order reaction the concentration of reactant decreases from 400 mol L –1 to 25 mol L –1 in 200 seconds. The…
- For the reaction, 2N 2 O 5 4NO 2 + O 2 , the rate of reaction can be expressed in terms of time and concentration by…
- For the reaction 2NH 3 → N 2 + 3H 2 , if - d [ NH _ 3 ] d t =k_ 1 [ NH _ 3 ], d [ ~N _ 2 ] d t =k_ 2 [ NH _ 3 ] d [ H _…
- The decomposition of dinitrogen pentoxide (N 2 O 5 ) follows first order rate law. What will be the rate constant from…
- The rate constant for the reaction, 2N 2 O 5 → 4NO 2 + O 2 is 2 × 10 –5 s –1 . If rate of reaction is 1.4 × 10 –5 mol L…
- The rate of the reaction : CH 3 COOC 2 H 5 + NaOH → CH 3 COONa + C 2 H 5 OH is given by the equation, rate = k [CH 3…
- The rate constant for a first order reaction at 300°C for which E a is 35 kcal mol –1 and frequency constant is 1.45 ×…
- Fill in the blanks by choosing the correct option. Order of the reaction is the __ _ X __ of the powers to which…
- Fill in the blanks in the following table for the reaction X + Y → Z . The reaction is of first order w . r . t X and…
- The temperature dependence of the rate of a chemical reaction can be explained by Arrhenius equation which is
- For the reaction 4NH 3 + 5O 2 4NO + 6H 2 O, if the rate of disappearance of NH 3 is 3.6 × 10 –3 mol L –1 s –1 , what is…
- In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice…
- What will be the rate equation for the reaction 2 X + Y → Z , if the order of the reaction is zero?
- What will be the half-life of the first order reaction for which the value of rate constant is 200 s –1 ?
- An endothermic reaction with high activation energy for the forward reaction can be shown by the figure
- 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…
- Rate of a general reaction A + B → products can be expressed as follows on the basis of collision theory. Rate = Z AB e…
- Assertion : Rate of reaction increases with increase in temperature. Reason : Number of effective collisions increases…
- Two plots are shown below between concentration and time t. Which of the given orders are shown by the graphs…
- Which of the following statements about the catalyst is true?
- Which of the following is an example of a fractional order reaction?
- The reaction 2 X → Y + Z would be zero order reaction when
- For a reaction X + Y → Z , rate ∝ [ X ]. What is (i) molecularity and (ii) order of reaction?
- For a reversible reaction, A + B C + D , the graph for rate of reaction with time is given below. Mark the terms ( p )…
- For a reaction R → P , the concentration of a reactant changes from 0.05 M to 0.04 M in 30 minutes. What will be the…
- For a reaction X → Y , the rate of reaction becomes twenty seven times when the concentration of X is increased three…
- Which of the following catalysts is not correctly matched with the reaction?
- Which of the following statements for order of reaction is not correct?
- The minus sign in rate =- d[A] d t indicates the _____ in concentration of the _____ with time. The rate of a reaction…
- The decomposition of a substance follows first order kinetics. If its concentration is reduced to 1/8 of its initial…
- For a reaction, 2NO + 2H 2 → N 2 + 2H 2 O, the possible mechanism is 2NO N 2 O 2 N 2 O 2 + H 2 N 2 O + H 2 O N 2 O + H…
- The potential energy diagram for a reaction X → Y is given. A and C in the graph corresponding to
- The graph of the effect of catalyst on activation energy is given below. Fill up the blanks X and Y with appropriate…
- A plot of log( a – x ) against time t is a straight line. This indicates that the reaction is of
- The number of molecules of the reactants taking part in a single step of the reaction is indicative of
- The rate of a gaseous reaction is given by the expression k [ A ] 2 [ B ] 3 . The volume of the reaction vessel is…
- For a reaction P + Q → 2 R + S . Which of the following statements is incorrect?
- Match the rate law given in column I with the dimensions of rate constants given in column II and mark the appropriate…
- The temperature dependence of the rate of a chemical reaction is given by Arrhenius equation, k = Ae –E a / RT . Which…
- The rate constant for a first order reaction is 2 × 10 –2 min –1 . The half-life period of reaction is
- If hydrogen and oxygen are mixed and kept in the same vessel at room temperature, the reaction does not take place to…
- A first order reaction: A Products, and a second order reaction: ZR Products, both have half-life time of 20 minutes…
- The rate constant of a first order reaction is 15 × 10 –3 s –1 . How long will 5.0 g of this reactant take to reduce to…
- Assertion : Complex reaction takes place in different steps and the slowest step determines the rate of reaction…
- Nitrogen dioxide (NO 2 ) dissociates into nitric oxide (NO) and oxygen (O 2 ) as follows: 2NO 2 → 2NO + O 2 If the rate…
- In a reaction 2HI → H 2 + I 2 , the concentration of HI decreases from 0.5 mol L –1 to 0.4 mol L –1 in 10 minutes. What…
- In a first order reaction, the concentration of reactant is reduced to 1/8 of the initial concentration in 75 minutes…
- Match the column I with column II and mark the appropriate choice. Column I Column II (A) Zero order (i) k_ 2 k_ 1 = E_…
- The chemical reaction, 2O 3 → 3O 2 proceeds as O 3 O 2 + [O] (fast) [O] + O 3 → 2O 2 (slow) The rate law expression…
- For the reaction A + B → products, what will be the order of reaction with respect to A and B ? Exp. [ A ] (mol L –1 )…
- In a reaction, 2 X → Y , the concentration of X decreases from 0.50 M to 0.38 M in 10 min. What is the rate of reaction…
- For the reaction N 2 + 3H 2 → 2NH 3 , how are the rate of reaction expressions inter-related d [ H _ 2 ] d t and d [ NH…
- Match the graphs given in column I with the order given in column II and mark the appropriate choice. Column I Column…
- Rate constant of two reactions are given below. Identifying their order of reaction. (i) (ii) k = 3.8 × 10 –4 s –1
- When a chemical reaction takes place, during the course of the reaction the rate of reaction
- A first order reaction takes 40 min for 30% decomposition. What will be t 1/2 ?
- The energy diagram of a reaction P + Q → R + S is given. What are A and B in the graph?
- For a reaction A 2 + B 2 2 AB the figure shows the path of the reaction in absence and presence of a catalyst. What…
- Match the plots in column I with their orders in column II and mark the appropriate choice. Column I Column II (A) (i)…
- In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice…
- The decomposition of a hydrocarbon follows the equation k = (4.5 × 10 11 s –1 ) e –28000 K/ T . What will be the value…
- Consider the reaction : 2N 2 O 4 4NO 2 . If - d [ ~N _ 2 O _ 4 ] d t =k and d [ NO _ 2 ] d t =k^ then
- In a pseudo first order hydrolysis of ester in water, the following results were obtained. t / s 0 30 60 90 Ester/mol L…
- For a certain reaction a large fraction of molecules has energy more than the threshold energy, still the rate of…
- For a reaction, I – + OCl – → IO – + Cl – in an aqueous medium, the rate of reaction is given by . The overall order of…
- To calculate activation energy of a chemical reaction
- A first order reaction has a rate constant 1.15 × 10 –3 s –1 . How long will 5 g of this reactant take to reduce to 3 g?
- Consider the reaction P → Q . The concentration of both the reactants and the products varies exponentially with time…