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UPSEE Solved Model Paper 4

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Question : 94

Total: 150

The major role of fluorspar (CaF2) which isadded in small quantity in the electrolytic reductionof alumina dissolved in fused cryolite (Na3AlF6) is :
I. to act as a catalyst
II. to make the fused mixture very conduction
III. to lower the temperature of melting
IV. to decrease the rate of oxidation of carbon at the anode

I, II
II, III
I, II, III
III, IV

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