Jamb Chemistry 2011 Past Questions and Answers

Question 26:

• JAMB 2011

The diagram above best illustrates the effect of decrease in

A. Concentration
B. Temperature
C. Surface area
D. Pressure

Question 27:

• JAMB 2011

MnO^-_4(aq) + Y + 5Fe²⁺_(aq) → Mn²⁺_(aq) + 5Fe²⁺_(aq) + 4H₂O^(l)
In the equation above, Y is

A. 5H⁺_(aq)
B. 4H⁺_(aq)
C. 10H⁺_(aq)
D. 8H⁺_(aq)

Question 28:

• JAMB 2011

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]

A. M = E/Q
B. M = EQ
C. M = Q/E
D. M = E/2Q

Question 29:

• JAMB 2011

The impurities formed during the laboratory preparation of chlorine gas are removed by

A. H₂O
B. NH₃
C. H₂SO₄
D. HCl

Question 30:

• JAMB 2011

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