(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

Name the metal $M$ which is extracted on the basis of following reactions:
$4M + 8CN^{-} + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^{-} + 4OH^{-}$
$2[M(CN)_2]^{-} + Zn \rightarrow [Zn(CN)_4]^{2-} + 2M$

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The Ellingham diagram for zinc,magnesium,and carbon converting into corresponding oxides is shown below. At $1100 \, ^oC$,which reaction is spontaneous to a maximum extent?

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The function of fluorspar $(CaF_2)$ in the electrolytic reduction of alumina $(Al_2O_3)$ dissolved in fused cryolite $(Na_3AlF_6)$ is

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Which of the following is used to remove silicon dioxide in the Serpeck's process for the purification of bauxite?

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The metal oxide which cannot be reduced to metal by carbon is

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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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Name the metal $M$ which is extracted on the basis of following reactions:$4M + 8CN^{-} + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^{-} + 4OH^{-}$$2[M(CN)_2]^{-} + Zn \rightarrow [Zn(CN)_4]^{2-} + 2M$

The Ellingham diagram for zinc,magnesium,and carbon converting into corresponding oxides is shown below. At $1100 \, ^oC$,which reaction is spontaneous to a maximum extent?

The function of fluorspar $(CaF_2)$ in the electrolytic reduction of alumina $(Al_2O_3)$ dissolved in fused cryolite $(Na_3AlF_6)$ is

Which of the following is used to remove silicon dioxide in the Serpeck's process for the purification of bauxite?

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Name the metal $M$ which is extracted on the basis of following reactions:
$4M + 8CN^{-} + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^{-} + 4OH^{-}$
$2[M(CN)_2]^{-} + Zn \rightarrow [Zn(CN)_4]^{2-} + 2M$