(a)[1]
State the name of the aluminium ore that is mainly aluminium oxide.
(b)[2]
State the meaning of the term electrolysis.
(c(i))[2]
Give two reasons why electrolysis is done on aluminium oxide dissolved in molten cryolite rather than on molten aluminium oxide alone.
(c(ii))[2]
Write the ionic half-equation for the reaction at the negative electrode.
(c(iii))[2]
Explain why the positive carbon electrodes need regular replacement.
(d)[1]
Explain the reason.
(e(i))[1]
State the meaning of the term amphoteric.
(e(ii))[2]
Write an equation for the reaction of aluminium oxide with aqueous sodium hydroxide.
(f)[2]
Predict the formulae for gallium(III) chloride and gallium(III) sulfate.