Chemical Kinetics Test

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Chemical Kinetics Test - 4

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Weekly Quiz Competition

Question 1
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Which of the following statement is true for order of a reaction?

A
It can have fractional value

B
It depends on the stiochiometric coefficients of reactants as well as products

C
It cannot be determined experimentally

D
It can be written from the balanced chemical equation

Solution

Order of a reaction is experimentally determined quantity so it can be negative fractional or zero.
Question 2
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For the first order reaction, half life is equal to

A

B

C

D
0.693/K

Solution

For 1st order reaction half life is independent of initial concentration of reactant.
Question 3
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Straight line graph for first order reaction is obtained between

A
Log [R₀ ] &t

B
[R] &t

C
ln[R] &t

D
None of these]

Solution
Question 4
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The effect of temperature on reaction rate is given by

A
Gibb ’s Helmholtz equation

B
Clausius Claperon equation

C
Arrhenius equation

D
Kirchoff ’s equation

Solution

k = A exp(-kt)
Question 5
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The chemical reaction in which reactants require high amount of activation energy are generally

A
Slow

B
Spontaneous

C
Instantaneous

D
Fast

Solution

If activation energy is high rate of reaction will decrease and reaction will be slow.
Question 6
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The minimum amount of energy required by the reacting molecules at the time of collisions in order to produce effective collisions is called

A
Threshold energy

B
Potential energy

C
Internal energy

D
Activation energy

Solution

The minimum energy that the colliding molecules must possess for the chemical reaction to occur is known as threshold energy.
The extra energy required by a reactant to participate in a reaction is called activation energy.
Question 7
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The expression which relates the rate of reaction to the concentration of the reactants are called?

A
Half life

B
Rate constant

C
Rate law

D
Differential rate equation

Solution

Rate law states that rate of reaction is dependent on concentration of reactant raise to power order of reaction.
Question 8
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The constant k used in rate equation is known as

A
Distance constant

B
Velocity constant

C
Reaction constant

D
Order constant

Solution

Rate constant is also known as velocity constant.
Question 9
1 / -0.25

The radioactive isotope used in determining the age of organic substances is

A
Carbon –14

B
Nitrogen –14

C
Nitrogen –15

D
Carbon –12

Solution

Carbon –14 is used in determining the age of organic substances
Question 10
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The substance that slows down the reaction without being consumed is known as

A
Hormones

B
Catalysis

C
Positive catalyst

D
Inhibitors

Solution

Inhibitors inhibits the action of catalyst and hence slows down the rate of reaction.