(C) In the Hall-Heroult process,the graphite anode is susceptible to oxidation by the oxygen gas liberated at the anode,which leads to its corrosion.

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Coke powder is sprayed at the top of electrolyte melt

(C) In the Hall-Heroult process,the graphite anode is susceptible to oxidation by the oxygen gas liberated at the anode,which leads to its corrosion. To prevent this,$Coke$ powder is sprinkled on the surface of the molten electrolyte. This layer of $Coke$ powder prevents the oxygen from coming into contact with the graphite anode,thereby protecting it from oxidation.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Reduction to free Metal

Easy

To prevent the corrosion of the anode in the Hall-Heroult process,which of the following action is done?

A
Coke powder is added to mix with electrolyte
B
Co-electrolytes like fluorspar is used
C
Coke powder is sprayed at the top of electrolyte melt
D
Anode is replaced by $Pt$ electrode instead of graphite electrode

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General Principles and Processes of Isolation of Elements

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Reduction to free Metal

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To prevent the corrosion of the anode in the Hall-Heroult process,which of the following action is done?

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In the extraction of silver,the following reactions take place:
$Ag_2S + NaCN \rightarrow A$
$A + Zn \rightarrow B$
If $B$ is a metal,identify $A$ and $B$.