1(x)
Substance which helps to lower the fusion point of the mixture in Hall Heroult Process:
- (a)Coke
- (b)Concentrated sodium hydroxide
- (c)Fluorspar
- (d)Concentrated potassium hydroxide
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Fluorspar
Reason — Fluorspar lowers the fusion point of the mixture in Hall Heroult Process and the mixture fuses at 950° C instead of 2050° C.