The correct order of increasing acidic strength of oxoacids of group- 15 elements is

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H3SbO4,H3PO4,H3AsO4 and HNO3

H3SbO4,H3A5O4,H3PO4 and HNO3

HNO3,H3SbO4,H3AsO4 and H3PO4

H3PO4,H3AsO4,H3SbO4 and HNO3

answer is B.

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Detailed Solution

As we move down the group, the acidic strength of oxyacid decreases.

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