Chemistry Past Questions and Answers

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