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Phosphorous can be extracted by:...

Phosphorous can be extracted by:

A

Heating Rock phosphate with coke and silica in an electric furnace

B

Heating white `P_4` at 573 K in an inert atmosphere

C

Heating red `P_4` in a sealed tube at 803 K

D

Heating white `P_4` at 473 K under high pressure

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