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NCERT Class XII Chemistry
Chapter - The p-Block Elements
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Question : 15 of 74
Marks: +1, -0
Give the disproportionation reaction of H3PO3\mathrm{H_3PO_3}.
Solution:  
The acids in +3 oxidation state of phosphorus tend to disproportionateto higher and lower oxidation states, e.g., phosphorous acid on heatingdisproportionates to give orthophosphoric acid and phosphine.
4H3PO3→3H3PO4+PH34\mathrm{H_3PO_3} \rightarrow 3\mathrm{H_3PO_4} + \mathrm{PH_3}
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