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A layer of coke is spread over bauxite during the extrection of aluminium. This acts as a/an

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A layer of coke is spread over bauxite during the extrection of aluminium. This acts as a/an
A. flux
B. slag to remove impurities
C. reducing agent
D. insulation and does not allow heat to excape
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Correct Answer - D
The fused electrolyte [a mixture containing alumina, cryolite `(Na_(3)AlF_(6))`, and fluorspar `(CaF_(2))` in the ratio of `20 : 40 : 20`] is covered with a layer of coke to prevent the escape of heat.
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