NEET
Chemistry
Chemical Kinetics
Previous Years Questions

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 $$10$$-$$3 mol L$$-$$1 s$$-$$1. If the concentration of A is 5 M, then concentratio... When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is The activation energy of a reaction can be determined from the slope of which of the following graphs? For a reaction between A and B the order with respect to A is 2 and the other with respect to B is 3. The concentrations of both A and B are doubled, ... A reaction is 50% complete in 2 hours and 75% complete in 4 hours. The order of reaction is What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20oC to 35oC? (R = 8.314 J mol$$-$$1 K$$-$$1)... In a reaction, A + B$$ \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 unit of rate constant for a zero order reaction is
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....
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...
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