Phosphorous acid on heating gives the following products : \[4{{H}_{3}}P{{O}_{3}}\xrightarrow{\Delta }3{{H}_{3}}P{{O}_{4}}+P{{H}_{3}}\]
The above reaction is an example of
A.
oxidation
B.
thermal decomposition
C.
disproportionation
D.
reduction
Answer :
disproportionation
Solution :
\[4{{H}_{3}}P{{O}_{3}}\xrightarrow{\Delta }3{{H}_{3}}P{{O}_{4}}+P{{H}_{3}}\]
In the reaction, the acid in + 3 oxidation state of $$P$$ tends to disproportionate to higher (+ 5) and lower (- 3) oxidation state in $${H_3}P{O_4}$$ and $$P{H_3}$$ respectively.
Releted MCQ Question on Inorganic Chemistry >> P - Block Elements
Releted Question 1
The reddish brown coloured gas formed when nitric oxide is oxidised by air is