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Standard XII
Chemistry
Overview of General Metallurgical Processes
Sulphide ores...
Question
Sulphide ores are calcinated to obtain the respective metal oxide.
A
True
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B
False
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Solution
The correct option is
B
False
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Q.
The sulphide ores are generally roasted to oxide for the extraction of metals instead of being directly
Q.
Consider the following isolation/purification processes.
(I) Heating impure metal with
I
2
at
150
−
200
∘
C
and passing the resulting volatile iodide on hot tungsten filament at
1400
∘
C
to get the pure metal.
(II) Heating the sulphide ore in the air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged metal sulphide to get the metal.
(III) Electrolysis of the molten electrolyte containing metal oxide and cryolite or fluorspar to obtain the metal.
The processes used for obtaining aluminium, titanium and lead are respectively :
Q.
In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with:
Q.
In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with
Q.
A sulphide ore like
Z
n
S
is first roasted to its oxide prior to its reduction by carbon because:
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