Explain the following (a) Generally sulphide ores are converted into oxides before reduction. (b) Silica is added to the sulphide ore of copper in the reverberatory furnance.
Text Solution
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(a)As show in Ellingha diagram which related Gibbs Free energy and temperature at below 710K. `DeltaG_((C,CO_(2)) lt DeltaG_((C,CO_(2))` So, `CO_(2)` is a better reducing agent than CO while above 710 K 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 temperature. ( c) Silica is a flux added to the sulphide ore of copper in the reverberatory furnance leading to the formation of slag `FeO+SiO_(2) to underset("Slag")(FeSiO_(3))` (d) Carbon and hydrogen are not used as reducing agents at high temperature. At high temperature carbonl and hydrogen readily form their carbides and hydrides respectively. (e) Vapour phase refining method is used for the purifiacation of Ti as `Ti+2I_(2) overset(532K) to TiI_(4) overset(1700K) to 2 I_(2)`
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Silica is added to the sulphide ore of copper in reverberatory furnace because
Why are sulphide ores converted to oxide before reduction?
Why are sulphide ores converted to oxide before reduction?
Explain the following (a) CO_(2) 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 furnance. (d) Carbon and hydrogen are not used as reducing agents at high temperature. (e) Vapour phase refining method is used for the purification of Ti
A sulphide ore is first converted into its oxide before reduction. This is done because :
Assertion : Sulphide ores are converted to oxides before reduction. Reason : Oxides are easier to reduce.
Which one of the following is not a sulphide ore ?
Sulphide ore of copper can be concentrated by
Sulphide ore is converted to oxide form by using the process
A sulphide ore is converted into metal oxide by the process of:
Knowledge Check
Silica is added to the sulphide ore of copper in reverberatory furnace because
A
1. sulphide ore of copper contains iron as impurity which is removed as iron slag.
B
2. silica reacts with `Cu_(2)O` to form slag
C
3. silica helps in reduction of `Cu_(2)O ` to Cu
D
4. sulphide ore of copper is separated from iron by reacting with silica.
Why are sulphide ores converted to oxide before reduction?
A
Sulphides cannot be reduced easily while oxides can be reduced easily.
B
Sulphides decompose on reduction hence they are first converted to oxides
C
Sulphides ore have higher melting points than oxides.
D
Oxides are more stable than sulphides hence easy to reduce.
Assertion : Sulphide ores are converted to oxides before reduction. Reason : Oxides are easier to reduce.
A
If both assertion and reason are true and reason is the correct explanation of assertion .
B
if both assertion and reason are true but reason is not the correct explanation of assertion
C
If assertion is true but reason is false
D
If both assertion and reason are false.
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