Chemical Kinetics

Chemistry
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A catalyst is a substance which

A
Increases the equilibrium constant of the reaction
B
Increases equilibrium concentration of products
C
Does not alter the reaction mechanism
D
Changes the activation energy of the reaction
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It would be a zero order reaction when:

A
the rate of reaction is proportional to square of conc.of A.
B
the rate of reaction remains same at any conc.of A.
C
the rate remains unchanged at any conc.of B and C.
D
the rate of reaction doubles if conc. of B is increased to double.
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On increasing the temperature by C:

A
number of collisions get doubled
B
value of rate constant does not change
C
energy of activation increases
D
number of fruitful collisions gets doubled
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For which order reaction, the unit of rate constant is

A
Zero order
B
First order
C
Second order
D
Third order
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While plotting decrease in mass against time, a flat curve shows:

A
fastest reaction.
B
reaction is slower.
C
reaction is over.
D
None of these.
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The reaction rate becomes double when the temperature increases :

A
approx C.
B
approx C.
C
approx C.
D
approx C.
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Chemical kinetics a branch of physical chemistry deals with:

A
structure of molecules
B
heat changes in a reaction
C
physical changes in a reaction
D
rate of reactions
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Which of the following theory is not related to the chemical kinetics?

A
Collision theory
B
Absolute theory
C
Absolute reaction rate
D
VSEPR theory
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Reactants molecule must gain a minimum amount of energy called the _____________ before they can transform into product molecules.

A
activation energy
B
reaction energy
C
equilibrium energy
D
none of the above
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