Chemical equilibra Generix Content - Chemical equilibra
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"Chemical equilibra" question number distribution across years
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JAMB questions for "Chemistry :: Chemical equilibra"
Q1

2h2(g) + O2(g) ↔ 2 H2O(g)      ΔH = -ve

What happens to the equilibrium constant of the reaction above if the temperature is increased?

A

It decreases

B

It increase increases

C

It is unaffected

D

It becomes zero

E
Q2

CuO(s) + H2(g) ↔ Cu(s) +l2O(l)

 

What is the effect of increasing the pressure on the equilibrium reaction above?

A

The equilibrium is shifted to the left

B

The equilibrium is shifted to the right

C

There is no effect

D

Molecule is produced

E
Q3

The equilibrium of an endothermic reaction which proceeds within an increase in volume can be shifted in the reverse direction by

A

increasing the temperature and decreasing the pressure

B

increasing the pressure and increasing the temperature

C

decreasing the temperature and increasing the pressure

D

decreasing the pressure and decreasing the temperature

E
Q4

A catalyst speeds up the rate of a chemical reaction by

A

taking part in the reaction

B

increasing the activation energy of the reaction

C

lowering the activation energy of the reaction

D

increasing the heat content

E
Q5

The rate of a reaction usually decreases with a decrease in the concentration of reactants because 

A

kinetic energy decreases

B

temperature increases

C

speed increases

D

reactants collisions decreases

E
Q6
Nuclear fission involves the splitting of a heavy element into two nuclei of
A
nearly equal masses with a release of energy and radiation
B
equal masses with a release of energy
C
equal masses with a release of energy and radiation
D
unequal masses without any release of energy
E
Q7
Which of these properties gives a solid its definite shape?
A
weak intermolecular attraction
B
High boiling point
C
High melting point
D
Strong intermolecular attraction
E
Q8
When at equilibrium, which of the reactions below will shift to the right if the pressure is increased  and the temperature is kept constant?
A
2H2(g) + O2(g) ↔ 2H2O(g)
B
2NO(g) ↔ N2(g) + O2(g)
C
2CO2(g) ↔ 2CO(g) + O2(g)
D
2SO3(g) ↔ 2SO2(g) + O2(g)
E
Q9
Which of the following equations shows that a reaction is in equilibrium?
A
&#916;G < O
B
&#916;G = &#916;H - T&#916;S
C
&#916;G > O
D
&#916;G = O
E
Q10
2SO2(aq) + O2(g) &#8596; 2SO3(g) &#916;H = -189 kJ mol-1 The equilibrium constant for the reaction above is increased by 
A
Increasing the pressure of the system
B
Increasing the pressure of the system
C
Increasing the surface area of the vessel
D
The addition of a catalyst to the system
E
Q11
For a reaction in equilibruim, the species involved in the equilibruim constant expression are
A
gaseous and solid species
B
liquid and solid species
C
solid and dissolved species
D
gaseous and dissolved species
E
Q12
N2O4 &#8596; 2NO2(g). Increase in total pressure of equilibrium reaction above will 
A
produce more of NO2(g) in the mixture
B
convert all of N2O4(g) to NO2(g)
C
have no effect on the concentration of NO2(g) and N2O4(g)
D
produce more of N2O4(g) in the mixture
E
Q13
3Cl2(g) + 2H2Og &#8596; 4HCl(g) + O2(g) &#916;H0 = +115kJ mol-1. In the above equilibruim reaction, a decrease in temperature will
A
favour the reverse reaction
B
favour the forward reaction
C
have no effect on the equilibruim state
D
double the rate of the reverse reaction
E
Q14
One method of driving the position of equilibruim of an endothermic reaction forward is to
A
increase temperature at constant pressure
B
decrease pressure at constant temperature
C
cool dowm the apparatus with water
D
decrease temperature at constant pressure
E
Q15
Which of the following equilibruim is shifted to the right as a result of an increase in pressure?
A
H2(aq) + l2(g) &#8596; 2Hl(g)
B
2NO2(g) &#8596; N2O4(g)
C
PCI5(s) &#8596; PCl3(aq) + Cl2(g)
D
2O3(s) &#8596; 3O2(g)
E
Q16
Which of the following is TRUE of Le Chatelier's Principle for an exothermic reaction?
A
increase in temperature will cause an increase in the equilibruim constant
B
increase in temperature will cause an decrease in the equilibruim constant
C
addition of a catalyst will cause an increase in the equilibruim constant
D
addition of a catalyst will cause a decrease in the equilibruim constant
E
Q17
10g of a solid is in equilibruim with its own vapour. When 1g of a small amount of solid is added, the vapour pressure
A
remains the same
B
drops
C
increases by 1%
D
increases by 99%
E
Q18
In what way is equilibruim constant for the forward reaction related to that of the reverse reaction?
A
The addition of the two is expected to be one
B
The product of the two is expected to be one
C
The two equilibruim constants are identical
D
The product of the two is always greater than
E
Q19
Which of the following equilibruim shows little or no net reaction when the volume of the system is decreased?
A
H2(g) + I2(g) &#8596; 2HI(g)
B
2NO2(g) &#8596; N2O4
C
PCI5(g) &#8596; PCI3(g) + CI2
D
ZnO(s) + CO2(g) &#8596; ZNCO3(s)
E
Q20
Which of the following equilibra is unaffected by a pressure change?
A
2NaCl(s) &#8596; 2Na(l) + Cl2(g)
B
H2(g) + l2(g) &#8596; 2Hl(g)
C
2O3(g) &#8596; 3O2(g)
D
2NO2(g) &#8596; N2O4(g)
E
Q21
The above graph shows a typical heating curve from the solid phase through the liquid phase to the gaseous phase of a substance. Which part of the curve shows solid and liquid in equilibruim?
A
T
B
U
C
X
D
Y
E
Q22
The reaction between sulphur (IV) oxide and oxygen is represented by the equilibruim reaction   2SO2(g) + O2(g) &#8596; 2SO3(g), &#916;H = -196kJ. What factor would influence increased production of SO3(g)?
A
Addition of a suitable catalyst
B
Increase in the temperature of the reaction
C
Decrease in the temperature of the reaction
D
Decrease in the concentration of SO2(g)
E
Q23
The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as
A
Brownian movement
B
Condensation
C
Evaporation
D
Liquifaction
E
Q24
20 cm3 of 0.1 molar NH4 OH solution when neutralized with 20.05 cm3 of 0.1 molar HCl liberated 120 Joules of heat. Calculate the heat of neutralization of NH4OH.
A
-51.0 kJ mol-1
B
+57.3 kJ mol -1
C
+57.0 kJ mol -1
D
+51.0 kJ mol -1
E
Q25
What is the consequence of increasing pressure on the equilibruim reaction ZnO(s) + H2(g) &#8596; Zn(s) + H2O(l)?
A
The equilibrium is driven to the left
B
The equilibrium is driven to the right
C
There is no effect
D
More ZnO(s) is produced
E
Q26
What are the values of x, y and z respectively in the equation: xCu + yHNO3 &#8594; xCu(NO3)2 + 4H2O + zNO?
A
4;1;2
B
3;8;2
C
2;8;3
D
8;3;2
E
Q27
The equilibrium reaction between copper (I) chloride and chloride at 250C and 1 atmosphere is represented by the equation;   2CuCl + Cl2 &#8596; 2CuCl2, &#916;H = -166kJ. Which of the following statements is TRUE for the reaction pressure remaining constant?
A
More CuCl2 is formed at 400C
B
More CuCl2 is formed at 100C
C
Less CuCl2 is formed at 100C
D
There is no change in the amount of CuCl2 formed at 400C and 100C
E
More CuCl2 is consumed at 400C
Q28
In the reaction N2(g) + O2(g) &#8596; 2NO(g) an increase in the total pressure will
A
cause less nitrogen to be produced in the equilibruim mixture
B
cause less nitric oxide to be produced in the equilibruim mixture
C
cause more nitric oxide to be produced in the equilibruim mixture
D
cause more oxygen to be produced in the equilibruim mixture
E
have no effect
Q29
The synthesis of sulphuric acid by the contact process employs the following equilibruim step as one of its stages:   2SO4(g) + O2&#8596; 2SO3(g) - &#916;H   Which of the following conditions promotes the backward reaction?
A
Increased pressure, decreased temperature.
B
Increased pressure, increased temperature and the presence of a catalyst.
C
Decreased pressure, decreased concentration of oxygen and increased temperature.
D
Decreased pressure, increased concentration of oxygen and increased temperature.
E
Decreased pressure, decreased concentration of oxygen and decreased temperature.