Question

The reaction, $$A$$ → Product, follows first order kinetics. In 40 minutes the concentration of $$A$$ changes from $$0.1$$ to $$0.025 M.$$  The rate of reaction, when concentration of $$A$$ is $$0.01 M$$  is

A. 1.73× 10 −4 M  min −1
B. 3.47× 10 −5 M  min −1
C. 3.47× 10 −4 M  min −1  
D. 1.73× 10 −5 M  min −1
Answer :   3.47× 10 −4 M  min −1
Solution :
For first order reaction , Rate = k [conc. of reactant] Since 0.1 M of X changes to 0.025 M in 40 minutes, t 1 2  of reaction= 40 2 =20 minutes Rate of reaction of X=k X = 0.693 t 1 2 × X = 0.693 20 ×0.01 =3.47× 10 −4 M  min −1

Releted MCQ Question on
Physical Chemistry >> Chemical Kinetics

Releted Question 1

If uranium (mass number 238 and atomic number 92) emits an $$\alpha $$ -particle, the product has mass no. and atomic no.

A. 236 and 92
B. 234 and 90
C. 238 and 90
D. 236 and 90
View Answer
Releted Question 2

The rate constant of a reaction depends on

A. temperature
B. initial concentration of the reactants
C. time of reaction
D. extent of reaction
View Answer
Releted Question 3

The specific rate constant of a first order reaction depends on the

A. concentration of the reactant
B. concentration of the product
C. time
D. temperature
View Answer
Releted Question 4

A catalyst is a substance which

A. increases the equilibrium concentration of the product
B. changes the equilibrium constant of the reaction
C. shortens the time to reach equilibrium
D. supplies energy to the reaction
View Answer

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Chemical Kinetics

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Physical ChemistrySome Basic Concepts in ChemistryStoichiometryStates of Matter Solid, Liquid and GasAtomic StructureChemical ThermodynamicsSolutionsSolid StateSurface ChemistryChemical EquilibriumIonic EquilibriumChemical KineticsRedox ReactionElectrochemistryNuclear Chemistry
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