Chemical Kinetics Test

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Chemical Kinetics Test - 5

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Question 1
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The chemical reaction in which reactants require high amount of activation energy are generally

A
Fast

B
Instantaneous

C
Spontaneous

D
Slow

Solution

As the energy of activation increases, more energy is required for reactants to complete the reaction hence chemical reaction become slow.
Question 2
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The rate of chemical reaction becomes double for every 10^o rise in temperature because of

A
Decrease in activation energy

B
Increase in number of activated molecules

C
Increase in activation energy

D
Increase in number of collisions between molecules having energy greater than activation energy

Solution

With increase in temperature molecular collisions increases therefore rate of reaction doubles. With every 10⁰ rises in temperature, the number of molecules which bring about the chemical reaction becomes double, so rate of chemical reaction also double.
Question 3
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The expression which relates the rate of reaction to the concentration of the reactants are called

A
Rate law

B
Rate constant

C
Differential rate equation

D
Half life

Solution

Rate law is defined as the mathematical relationship between rate of a reaction and the molar concentration of the reactants as determined experimentally.
Question 4
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The constant k used in rate equation is known as

A
Order constant

B
Distance constant

C
Velocity constant

D
Reaction constant

Solution

It is describing the speed of a reaction i.e. how concentration of reactant changes w.r.t. time. Hence it is called Velocity constant
Question 5
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The radioactive isotope used in determining the age of organic substances is

A
Carbon – 12

B
Carbon –14

C
Nitrogen – 14

D
Nitrogen – 15

Solution

The ratio of Carbon -12 to Carbon-14 at the moment of death is the same as every other living thing., but Carbon-14 decays and is not replaced. The carbon-14 decays with its half-life of 5770 years., while the amount of Carbon-12 remains constant in the sample. By looking at the ratio of Carbon-12 to Carbon-14 in the sample and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing fairly precisely.
Question 6
1 / -0

A reaction whose order is different from the actual due to large excess concentration of one of the reactants is called

A
Pseudo – 1st order reaction

B
Second order reaction

C
Zero order reaction

D
First order reaction

Solution

The concentration of the reactants used in excess remains unaltered during the course of the reaction.