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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn142

Select the correct statement(s) about phosphine.

  1. AImpure phosphine can catch fire spontaneously because it contains traces of .
  2. B is a weaker base than .
  3. C forms strong intermolecular hydrogen bonds like .
  4. DIt can be prepared by the action of water on calcium phosphide.

Answer: A, B, D

is a standard preparation. P is larger and less electronegative, so its lone pair is less available and PH3 is a weaker base. Diphosphine vapour ignites in air. PH3 does not form significant hydrogen bonds, so the last statement is false.
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