Multiple choice

White phosphorus is formed by the combination of

  1. CaO + P2O5

  2. PBr3 + Hg

  3. P4 + Na

  4. Ca3(PO4)2 + SiO2 + C

  5. (1) and (2) are both correct.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because the white phosphorus is manufactured from the calcium phosphate by modern electrothermic process. A mixture of phosphorite or bone ash, silica and coke in electric furnace, at about 15000C, the vapour of phosphorus are taken for cold water condensation as a form of white phosphorus.

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