There is a slight difference in acidic strength of the H3PO4, H3PO3 and H3PO2 because

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number of unprotonated O-atoms responsible for increase of acidity due to inductive effect, remains the same

phosphorus oxides are less basic

phosphorus in these acids exists in different oxidation states

phosphorus is not a highly electronegative element

answer is A.

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Detailed Solution

Number of unprotonated oxygen responsible for increase of acidity remains the same

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