(a)i. State two characteristics of a homologous series.

(ii) Explain briefly why there are differences in the reaction of ethane and ethene.

(b) When crystals of sodium chloride were warmed with concentrated tetraoxosulphate( VI) acid, a gas was evolved.
(i) Name the gas.
(ii) State two physical properties of the gas.
(iii) Write a balanced chemical equation for the reaction.

(c)i. What are hydrocarbons?
(ii) State two natural sources of hydrocarbons.
(iii) A hydrocarbon contains 83% of carbon by mass. Calculate its empirical formula. [H=1.0, C=12.0]

(d) Draw and label a diagram of a set-up that could be used to electroplate a copper ornament with silver