NEET
Chemistry
Chemical Kinetics
Previous Years Questions

MCQ (Single Correct Answer)

For a reaction $$3 \mathrm{~A} \rightarrow 2 \mathrm{~B}$$ The average rate of appearance of $$\mathrm{B}$$ is given by $$\frac{\Delta[B]}{\Delta t}$$...
The correct options for the rate law that corresponds to overall first order reaction is
For a certain reaction, the rate $$=\mathrm{k}[\mathrm{A}]^{2}[\mathrm{~B}]$$, when the initial concentration of A is tripled keeping concentration of...
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : A reaction can have zero activatio...
For a chemical reaction 4A + 3B $$\to$$ 6C + 9D Rate of formation of C is 6 $$\times$$ 10$$-$$2 mol L$$-$$1 s$$-$$1 and rate of disappearance of A is ...
The given graph is a representation of kinetics of a reaction The y and x axes for zero and first order reactions, respectively are...
For a first order reaction A $$\to$$ Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for the react...
For a reaction, A $$\to$$ B, enthalpy of reaction is $$-$$4.2 kJ mol$$-$$1 and enthalpy of activation is 9.6 kJ mol$$-$$1. The correct potential energ...
The slope of Arrhenius plot $$\left( {\ln \,k\,v/s{1 \over T}} \right)$$ of first order reactino is $$-$$5 $$\times$$ 103K. The value of Ea of the rea...
An increase in the concentration of the reactants of a reaction leads to change in :
The rate constant for a first order reaction is 4.606 $$ \times $$ 10-3 s-1. The time required to reduce 2.0 g of the reactant to 0.2 g is :...
If the rate constant for a first order reaction is k, the time (t) required for the completion of 99 % of the reaction is given by :
For the chemical reaction N2(g) + 3H2(g) ⇌ 2NH3(g) the correct option is :
The correct difference between first and second order reactions is that
When initial concentration of the reactant is doubled, the half-life period of a zero order reaction
Mechanism of a hypothetical reaction X2 + Y2 $$ \to $$ 2XY, is given below : (i)   X2 $$ \to $$ X + X (fast) (ii)  X + Y2 $$\r...
A first order reaction has a specific reaction rate of 10$$-$$2 sec$$-$$1. How much time will it take for 20 g of the reactant to reduce to 5 g? ...
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
The rate of first-order reaction is 0.04 mol L$$-$$1 s$$-$$1 at 10 seconds and 0.03 mol L$$-$$1 s$$-$$1 at 20 seconds after initiation of the reaction...
The addition of a catalyst during a chemical reaction alters which of the following quantities?
The rate constant of the reaction A $$ \to $$ B is 0.6 $$ \times $$ 10$$-$$3 mol L$$-$$1 s$$-$$1. If the concentration of A is 5 M, then concentratio...
The activation energy of a reaction can be determined from the slope of which of the following graphs?
When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is
For a reaction between A and B the order with respect to A is 2 and the other with respect to B is 3. The concentrations of both A and B are doubled, ...
A reaction is 50% complete in 2 hours and 75% complete in 4 hours. The order of reaction is
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20oC to 35oC? (R = 8.314 J mol$$-$$1 K$$-$$1)...
In a reaction, A + B $$ \to $$ product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentra...
In a zero-order reaction, for every 10oC rise of temperature, the rate is doubled. If the temperature is increased from 10oC to 100oC, the rate of the...
The rate of the reaction :   2N2O5 $$ \to $$ 4NO2 + O2 can be written in three ways. $${{ - d\left[ {{N_2}{O_5}} \right]} \over {dt}} = k\l...
The half-life of a substance in a certain enzyme-catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1....
The unit of rate constant for a zero order reaction is
Which one of the following statements for the order of a reaction is incorrect?
The rate of the reaction, 2NO + Cl2 $$ \to $$ 2NOCl is given by the rate equation rate = k[NO]2[Cl2]. The value of the rate constant can be increased ...
For the reaction N2O5(g) $$ \to $$  2NO2(g) + 1/2O2(g) the value of rate of disappearance of N2O5 is given as 6.25 $$ \times $$ 10$$-$$3 m...
During the kinetic study of the reaction, 2A + B $$ \to $$ C + D, following results were obtained .tg {border-collapse:collapse;border-spacing:0;} ....
For the reaction, N2 + 3H2 $$ \to $$ 2NH3, if $${{d\left[ {N{H_3}} \right]} \over {dt}}$$ = 2 $$ \times $$ 10$$-$$4 mol L$$-$$1 s$$-$$1, the value of...
In the reaction, BrO$$_{3(aq)}^ - $$ + 5Br$$_{(aq)}^ - $$ + 6H+ $$ \to $$ 3Br2(l) + 3H2O(l). The rate of appearance of bromine (Br2) is related...
For the reaction A + B $$ \to $$ products, it is observed that (i)  on doubling the initial concentration of A only, the rate of reaction is...
Half-life period of a first order reaction is 1386 seconds. The specific rate constant of the reaction is
The rate constants k1 and k2 for two different reactions are 1016 $$ \cdot $$ e$$-$$2000/T and 1015 $$ \cdot $$ e$$-$$1000/T, respectively. The tem...
The bromination of acetone that occurs in acid solution is represented by this equation. CH3COCH3(aq) + Br2(aq)  $$ \to $$   &nbs...
If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately (log 4 = 0.60, log 5 = 0.6...
In a first-order reaction A $$ \to $$ B, if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is
The reaction of hydrogen and iodine monochloride is given as : H2(g) + 2ICl(g) $$ \to $$ 2HCl(g) + I2(g) This reaction is of first order with respect...
Consider the reaction :  N2(g) + 3H2(g) $$ \to $$ 2NH3(g) The equality relationship between $${{d\left[ {N{H_3}} \right]} \over {dt}}$$ and ...
For the reaction, 2A + B $$ \to $$ 3C + D, which of the following does not express the reaction rate?
The rate of reaction between two reactions A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reactio...
For a first order reaction A $$ \to $$ B the reaction rate a reactant concentration of 0.01 M is found to be 2.0 $$ \times $$ 10$$-$$5 mol L$$-$$1 s$$...
The rate of a first order reaction is 1.5 $$ \times $$ 10$$-$$2 mol L$$-$$1 min$$-$$1 at 0.5 M concentration of the reactant. The half-life of the rea...
The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, $$k = A \cdot {e^{ - E{}^ * /RT}}$$....
If the rate of the reaction is equal to the rate constant, the order of the reaction is
The reaction A $$ \to $$ B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken f...
The activation energy for a simple chemical reaction A $$\rightleftharpoons$$ B is E$$a$$ in forward direction. The activation energy for reverse reac...
2A $$ \to $$ B + C It would be a zero order reaction when
When a bio-chemical reaction is carried out in laboratory, outside the human body in absence of enzyme, then rate of reaction obtained is 10$$-$$6 tim...
For the reaction; 2N2O5 $$ \to $$ 4NO2 + O2 rate and rate constant are 1.02 $$ \times $$ 10$$-$$4 and 3.4 $$ \times $$ 10$$-$$5 sec$$-$$1 respecti...
How enzymes increases the rate of reactions
For the reaction H+ + BrO$$_3^ - $$ + 3Br$$-$$ $$ \to $$ 5Br2 + H2O which of the following relation correctly represents the consumption and formation...

MCQ (More than One Correct Answer)

Activation energy (E$$a$$) and rate constants (k1 and k2) of a chemical reaction at two different temperatures (T1 and T2) are related by...
EXAM MAP
Joint Entrance Examination
JEE MainJEE AdvancedWB JEEBITSATMHT CET
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN