Chemical Kinetics Test

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Chemical Kinetics Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

The unit of rate constant for a first order reaction is

A
s^–1

B
Mol/L/s

C
Mol/L

D
Mol²/L²/s²

Solution

unit of rate constant for nth order reaction (k) = (mol L⁻¹)¹⁻ⁿs⁻¹
put, n=1 ;
unit of rate constant for 1st order reaction( k) = s⁻¹
Question 2
1 / -0

Reaction which takes place in one step is known as

A
Elementary reaction

B
Bimolecular reaction

C
Unimolecular reaction

D
Reaction rate

Solution

An elementary reaction is a chemical reaction in which one or more chemical species react directly to form products in a single reaction step and with a single transition state
Question 3
1 / -0

Which among the following statement is not true for rate constant of a reaction?

A
Rate constant changes with temperature

B
Rate constant depend upon the concentration of the reactants

C
Unit of rate constant depend upon the order of reaction

D
Rate constant has a definite value at a particular temperature

Solution

Rate constant is independent of concentration of reactant for a particular reaction.
Question 4
1 / -0

Which among the following is an example of pseudo first order reaction?

A
Acid catalysed hydrolysis of ethyl acetate

B
Decomposition of hydrogen peroxide

C
Dehydration of oxalic acid

D
Decomposition of nitrogen pentoxide

Solution

In acid catalysed the hydrolysis of ethyl acetate the water is in excess so it is pseudo 1st order reaction, as the does not change.
Question 5
1 / -0

Which among the following is an example of photochemistry used in our daily life?

A
In inversion of cane sugar

B
In photography

C
In decomposition of hydrogen peroxide

D
All of these

Solution

Photography is an example of photochemistry used in our daily life. Reaction takes place in the presence of light
Question 6
1 / -0

The ionic reactions are generally very fast because

A
Reactions are highly exothermic

B
The energy of interaction is between charged ion is greater than between neutral molecules

C
The number of collisions between ions are very large

D
It does not involve bond breaking

Solution

Ionic reactions does not involve bond breaking. energy is directly used in completing the reaction, therefore they are fast.

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Re-Attempt Weekly Quiz Competition

Chemical Kinetics Test - 7

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Chemical Kinetics Test - 7

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SHARING IS CARING

Question 1

s–1

Mol/L/s

Mol/L

Mol2/L2/s2

Solution

Question 2

Elementary reaction

Bimolecular reaction

Unimolecular reaction

Reaction rate

Solution

Question 3

Rate constant changes with temperature

Rate constant depend upon the concentration of the reactants

Unit of rate constant depend upon the order of reaction

Rate constant has a definite value at a particular temperature

Solution

Question 4

Acid catalysed hydrolysis of ethyl acetate

Decomposition of hydrogen peroxide

Dehydration of oxalic acid

Decomposition of nitrogen pentoxide

Solution

Question 5

In inversion of cane sugar

In photography

In decomposition of hydrogen peroxide

All of these

Solution

Question 6

Reactions are highly exothermic

The energy of interaction is between charged ion is greater than between neutral molecules

The number of collisions between ions are very large

It does not involve bond breaking

Solution

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s^–1

Mol²/L²/s²