A) hypo phosphorous acid reduces silver nitrate to silver
B) in solid state \[PC{{l}_{5}}\] exists as \[{{[PC{{l}_{4}}]}^{+}}{{[PC{{l}_{6}}]}^{-}}\]
C) pure phosphine is non-inflammable
D) phosphorous acid on heating disproport- ionates to give met phosphoric acid and phosphine.
Correct Answer: D
Solution :
: \[\underset{acid}{\mathop{\underset{Phosphorous}{\mathop{4{{H}_{3}}P{{O}_{3}}}}\,}}\,\xrightarrow[\Delta ]{{{200}^{o}}C}\underset{acid}{\mathop{\underset{Orthophosphoric}{\mathop{3{{H}_{3}}P{{O}_{4}}}}\,}}\,+\underset{Phosphine}{\mathop{P{{H}_{3}}}}\,\]
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