2011 - JAMB Chemistry Past Questions and Answers - page 2

The function of zinc electrode in a galvanic cells is that it

CH_4(g) + Cl_2(g) → CH₃ Cl_(s) + HCl_(g)
The major factor that influence the rate of the reaction above is

The condition required for corrosion to take place is the presence of

The diagram above best illustrates the effect of decrease in

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

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]

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

The effect of the presence of impurities such as carbon and sulphur on iron is that they

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

The bleaching action of chlorine gas is effective due to the presence of