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Hydrogen sulphide is a highly toxic and flammable gas. It is normally prepared in a fume chamber.
(a) Name two reagents that can be used to prepare hydrogen sulphide in the laboratory.
(b) One of the uses of hydrogen sulphide is to produce sulphur as shown in the following equation:
#2H_2S(g) +SO_2(g) 3S(s) + 2H_2O#(l)
Identify the reducing agent in this reaction and give a reason for your answer.
(c) Other than production of sulphuric (VI) acid, state one commercial use of sulphur.

Answer Text:
(a) -iron(II) sulphide
-dilute hydrochloric acid
(b) Hydrogen sulphide is reducing agent. Oxidation number of sulphur in #H_2S# increases from -2 to 0 showing that it undergoes oxidation hence the reducing agent.
(c) Used in vulcanization of rubber.