Question

11. Phosphorus normally exhibits a covalency of
O A) +3 and +5
O B) +2 and +3
O c) +1 and +2
D) +3 and +4
12. Function of adding cryolite in the extraction of aluminium from pure
alumina is
O A) to increase the fusion temperature​

Answer 1

Answer:

1Phosphorus shows a covalency of +3 and +5.

Explanation:

2Instead, it is dissolved in molten cryolite – an aluminium compound with a lower melting point than aluminium oxide. The use of molten cryolite as a solvent reduces some of the energy costs involved in extracting aluminium by allowing the ions in aluminium oxide to move freely at a lower temperature.

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