2011 - JAMB Chemistry Past Questions and Answers - page 2
11
The function of zinc electrode in a galvanic cells is that it
A
undergoes reduction
B
serves as the positive electrode
C
production electons
D
uses up electrons
correct option: c
Users' Answers & Comments12
CH4(g) + Cl2(g) → CH3 Cl(s) + HCl(g)
The major factor that influence the rate of the reaction above is
The major factor that influence the rate of the reaction above is
A
catalyst
B
temperature
C
concentration
D
light
correct option: d
Users' Answers & Comments13
The condition required for corrosion to take place is the presence of
A
water and carbon (IV) oxide
B
water, carbon (IV) oxide and oxygen
C
oxygen and carbon (IV) oxide
D
water and oxygen
correct option: d
Users' Answers & Comments14
A
concentration
B
temperature
C
surface area
D
pressure
correct option: a
Users' Answers & Comments15
MnO-4(aq) + Y + 5Fe2+(aq) → Mn2+(aq) + 5Fe2+(aq) + 4H2O(l)
In the equation above, Y is
In the equation above, Y is
A
5H+(aq)
B
4H+(aq)
C
10H+(aq)
D
8H+(aq)
correct option: d
Users' Answers & Comments16
Given that M is the mass of a substance deposited during electrolysis and Q is the quantity of electricity consumed, then Faraday's first law can be written as
[Electrochemical equivalent]
[Electrochemical equivalent]
A
M = E/Q
B
M = EQ
C
M = Q/E
D
M = E/2Q
correct option: b
Users' Answers & Comments17
The impurities formed during the laboratory preparation of chlorine gas are removed by
A
H2O
B
NH3
C
H2SO4
D
HCl
correct option: a
Users' Answers & Comments18
The effect of the presence of impurities such as carbon and sulphur on iron is that they
A
give it high tensile strenght
B
make it malleable and ductile
C
increase its melting point
D
lower its melting point
correct option: d
Users' Answers & Comments19
A few drops of concentrated HNO3 is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation presents is likely to be
A
Pb2+
B
Cu2+
C
Fe3+
D
Fe2+
correct option: d
Users' Answers & Comments20
The bleaching action of chlorine gas is effective due to the presence of
A
hydrogen chloride
B
water
C
air
D
oxygen
correct option: b
Users' Answers & Comments