MCQ
Which one is make a conducting solution?
- APure aluminium oxide
- BCoke
- ✓Cryolite
- DAll of these
✓
Answer
Correct option: C.
Cryolite
Pure alumina melts at about $2000^\circ C$ and is a bad conductor of electricity. If fused cryolite and fluorspar is added, the mixture melts at $900^\circ C$ and $\mathrm{Al}_2 \mathrm{O}_3$ becomes a good conductor of electricity.
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