Engineering Entrance Sample Papers

JEE Mains Chemical Equilibrium Sample Questions

Chemistry - Chemical Equilibrium

Objective Chemical and Ionic Equilibrium Practice Problems / Questions:

Equilibrium Practice Problems

Question 1
According to law of mass action rate of a chemical reaction is proportional to
A
Concentration of reactants
B
Molar concentration of reactants
C
Molar concentration of products
D
Concentration of products
Question 2
The solution of strong acid and weak base (FeCl3) is
A
Acidic
B
None of these
C
Basic
D
Neutral
Question 3
If a system is at equilibrium the rate of forward to the reverse reaction is
A
High
B
Less
C
At equilibrium
D
Equal
Question 4
Which of the following conditions represents an equilibrium?
A
Water is boiling in an open vessel over stove, temperature of water is constant
B
Few drops of water is present along with air in a balloon, temperature of balloon is constant
C
None of these are correct for the equilibrium
D
Freezing of ice in a open vessel, temperature of ice is constant
Question 5
Hydrolysis of sodium acetate will give
A
Neutral solution
B
Normal solution
C
Acidic solution
D
Basic solution
Question 6
Theory of ‘active mass’ indicates that the rate of chemical reaction is directly proportional to the
A
Properties of reactants
B
Concentration of reactants
C
Equilibrium constant
D
Volume of apparatus
Question 7
All reactions which have chemical disintegration

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A
Is reversible
B
Is exothermic
C
Is reversible or irreversible and endothermic or exothermic
D
Is reversible and endothermic
Question 8
In a reaction the rate of reaction is proportional to its active mass, this statement is known as
A
Faraday law of electrolysis
B
Law of constant proportion
C
Le-chatelier principle
D
Law of mass action
Question 9
The law of mass action was enunciated by
A
Birthelot
B
Graham
C
Guldberg and Waage
D
Bodenstein
Question 10
The number of gram molecules of a substance present in unit volume is termed as

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A
Active mass
B
Molar concentration
C
Activity
D
Normal solution
Question 11
Chemical equations convey quantitative information on the
A
Quantity of reactant consumed and quantity of product formed
B
Number of atoms/molecules of the reactants and products involved in the reaction
C
Relative number of moles of reactants and products involved in the reaction
D
Type of atoms/molecules taking part in the reaction
Question 12
pH values of HCl and NaOH solutions each of strength N/100 will be respectively
A
12 and 2
B
2 and 2
C
2 and 10
D
2 and 12
Question 13
A chemical reaction is at equilibrium when
A
Reactants are completely transformed into products
B
Equal amounts of reactants and products are present
C
The rates of forward and backward reactions are equal
D
Formation of products is minimized
Question 14
Which of the following is a characteristic of a reversible reaction?
A
Number of moles of reactants and products are equal
B
It can be influenced by a catalyst
C
None of these
D
It can never proceed to completion
Question 15
In any chemical reaction, equilibrium is supposed to be establish when
A
Velocity of mutual reactions become equal
B
Mutual opposite reactions undergo
C
Concentration of reactants and resulting products are equal
D
The temperature of mutual opposite reactions become equal
Question 16
A solution of sodium bicarbonate in water turns
A
Blue litmus red
B
Methyl orange yellow
C
Methyl orange red
D
Phenolphthalein pink
Question 17
Raising the temperature of an equilibrium system
A
Favours the exothermic reaction only
B
Favours neither the exothermic nor endothermic reactions
C
Favours both the exothermic and endothermic reactions
D
Favours the endothermic reaction only
Question 18
For the reaction H2 + I2 = 2HI, the equilibrium concentration of H2, I2 and HI are 8.0, 3.0 and 28.0 mol per litre respectively, the equilibrium constant of the reaction is
A
36.66
B
32.66
C
34.66
D
30.66
Question 19
A reversible chemical reaction having two reactants in equilibrium. If the concentrations of the reactants are doubled, then the equilibrium constant will
A
Remain the same
B
Be halved
C
Become one-fourth
D
Also be doubled
Question 20
Under a given set of experimental conditions, with increase in the concentration of the reactants, the rate of a chemical reaction
A
Increases
B
Decreases
C
Remains unaltered
D
First decreases and then increases
Question 21
The rate at which substances react depends on their
A
Equivalent weight
B
Molecular weight
C
Atomic weight
D
Active mass
Question 22
A solution of sodium borate has a pH of approximately
A
Between 4 to 5
B
= 7
C
> 7
D
< 7
Question 23
A reversible reaction is one which

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A
Proceeds spontaneously
B
Proceeds in both directions
C
All the statements are wrong
D
Proceeds in one direction
Question 24
When rate of forward reaction becomes  equal to backward reaction, this state is termed as?
A
All of these
B
Chemical equilibrium
C
Equilibrium
D
Reversible state
Question 25
Which of the following statements regarding a chemical equilibrium is wrong?

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A
An equilibrium can be shifted by altering the temperature or pressure
B
The same state of equilibrium is reached whether one starts with the reactants or the products
C
An equilibrium is dynamic
D
The forward reaction is favoured by the addition of a catalyst
Question 26
A reversible chemical reaction having two reactants in equilibrium. If the concentrations of the reactants are doubled, then the equilibrium constant will
A
Remain the same
B
Become one-fourth
C
Also be doubled
D
Be halved
Question 27
The number of gram molecules of a substance present in unit volume is termed as
A
Active mass
B
Normal solution
C
Activity
D
Molar concentration
Question 28
A buffer solution has equal volumes of 0.2 M NH4OH and 0.02 M NH4Cl. The pKb of the base is 5. The pH is

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A
10
B
9
C
7
D
4
Question 29
The chemical equilibrium of a reversible reaction is not influenced by
A
Pressure
B
Concentration of the reactants
C
Catalyst
D
Temperature
Question 30
In a solution of pH = 5, more acid is added in order to reduce the pH = 2. The increase in hydrogen ion concentration is

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A
5 times
B
100 times
C
3 times
D
1000 times
Question 31
The equilibrium constant in a reversible reaction at a given temperature
A
It is not characteristic of the reaction
B
Depends on the concentration of the products at equilibrium
C
Does not depend on the initial concentrations
D
Depends on the initial concentration of the reactants
Question 32
Which of the following will favour the reverse reaction in a chemical equilibrium?

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A
Increasing the concentration of one or more of the products
B
Removal of at least one of the products at regular intervals
C
Increasing the concentration of the reactants
D
Increasing the pressure
Question 33
In any chemical reaction, equilibrium is supposed to be establish when
A
Concentration of reactants and resulting products are equal
B
The temperature of mutual opposite reactions become equal
C
Mutual opposite reactions undergo
D
Velocity of mutual reactions become equal
Question 34
The equilibrium constant in a reversible reaction at a given temperature
A
It is not characteristic of the reaction
B
Depends on the initial concentration of the reactants
C
Does not depend on the initial concentrations
D
Depends on the concentration of the products at equilibrium
Question 35
K for the synthesis of HI is 50. K for dissociation of HI is
A
0.02
B
50
C
5
D
0.2
Question 36
The active mass of 64 gm of HI in a two litre flask would be
A
2
B
0.25
C
5
D
1
Question 37
When rate of forward reaction becomes equal to backward reaction, this state is termed as?
A
Chemical equilibrium
B
Equilibrium
C
Reversible state
D
All of these
Question 38
The acid that results when a base accepts a proton is called
A
Lewis base
B
Conjugate protonated base
C
Conjugate base of the acid
D
Conjugate acid of the base
Question 39
According to law of mass action rate of a chemical reaction is proportional to

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A
Molar concentration of products
B
Molar concentration of reactants
C
Concentration of products
D
Concentration of reactants
Question 40
Chemical equilibrium is dynamic in nature because
A
Both forward and backward reactions occur at all times with same speed
B
Equilibrium is maintained rapidly
C
The concentration of reactants and products become same at equilibrium
D
The concentration of reactants and products are constant but different
Question 41
Which is false?
A
The point of dynamic equilibrium is reached when the reaction rate in one direction just balances the reaction rate in the opposite direction
B
The dissociation of weak electrolyte is a reversible reaction
C
The presence of free ions facilitates chemical changes
D
The greater the concentration of the substances involved in a reaction, the lower the speed of the reaction
Question 42
Le-Chatelier’s principle is applicable only to a
A
Heterogeneous reaction
B
Irreversible reaction
C
System in equilibrium
D
Homogeneous reaction
Question 43
In a reaction the rate of reaction is proportional to its active mass, this statement is known as
A
Law of mass action
B
Law of constant proportion
C
Faraday law of electrolysis
D
Le-chatelier principle
Question 44
Theory of ionization was given by
A
Arrhenius
B
Rutherford
C
Graham
D
Faraday
There are 44 questions to complete.
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