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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Phosphorus allotropes, phosphine, halides and oxyacids of phosphorus
JEE Main levelOne or more correct optionsDifficulty 2 of 3pn047

Which of the following statements about the allotropes of phosphorus are correct?

  1. AWhite phosphorus exists as an infinite polymeric chain.
  2. BWhite phosphorus is soluble in carbon disulphide.
  3. CBlack phosphorus has a layered structure and is obtained by heating white phosphorus under high pressure.
  4. DRed phosphorus is obtained by heating white phosphorus at about 573 K in an inert atmosphere.

Answer: B, C, D

White P is discrete and dissolves in ; red P is made by heating white P at 573 K without air; black P forms under high pressure and has a layered structure. White P is not polymeric (red P is). Correct: A, B, C.
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