is a better reducing agent below
710 K whereas CO is a better reducing agent above 710 K.
(b)
Generally sulphide ores are converted into oxides before reduction.
(c) Silica
is added to the sulphide ore of copper in the reverberatory furnace.
(d) Carbon
and hydrogen are not used as reducing agents at high temperatures.
(e) Vapour phase
refining method is used for the purification of Ti.
Answer:
(a) As shown in
Ellingham diagram which relates Gibbs free energy and temperature at below 71
OK.
is a better reducing agent than CO
while above 71 OK it
becomes a
very good reducing agent.
(b)
Generally, sulphide ores are converted to oxides before reduction as reduction
of oxides can easily be done using C or CO depending upon metal ore
and.temperatu.re.
(c) Silica
is a flux added to the sulphide ore of copper in the reverberatory furnace
leading to the formation of slag
(d) Carbon
and hydrogen are not used as reducing agents at high temperature. At high temperature
carbon and hydrogen readily form their carbides and hydrides respectively.
(e) Vapour
phase refining method is used for the purification of Ti as
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