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p -Block elements - ll — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
The three important oxidation states of phosphorus are
  • ✓
    $ - 3,\, + 3$ and $ + 5$
  • B
    $ - 3,\, + 3$ and $ - 5$
  • C
    $ - 3,\, + 4$ and $ - 4$
  • D
    $ - 3,\, + 3$ and $ + 4$
✓

Answer

Correct option: A.
$ - 3,\, + 3$ and $ + 5$
a
Three important oxidation states of phosporous are:

$+3$ is due to the participation of only $3 P ^3$ (due to inert pair effect). Only three electrons involve in bond formation.

$+5$ is due to the participation of $3 s ^2 3 P ^3$ (due to absence of inert pair effect). All the five electrons involves in bond formation.

$-3$ is due to gain of three electrons as it has five electrons in valence shell so as to attain octet configaration.

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