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  4. There is very little difference in acid strength in the series H3PO3 and H3PO2 because

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Q. There is very little difference in acid strength in the series $H_3PO_3$ and $H_3PO_2$ because

The p-Block Elements - Part2

Solution:

$H_3PO_4, H_3PO_3$ and $H_3PO_2$ all have equal number of unprotonated oxygen responsible for increase of acidity. So they have very little difference in acid strength.