Question

the correct order of decreasing acidic strength of oxyacids of group 15 elements and why
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Answer 1

What is the order for decreasing the acidic strength of oxoacid of group 15?



Group 15 elements are : N/P/As/Sb which forms oxoacids. Except N, others can form various types of oxo-acids with many oxidation state due to availability of “d” orbitals.

So as a comparison we take the most common +5 state for N and others too. The acidic strength follows the order: HNO3>H3PO4>H3AsO4>H3SbO4. This occurs due to the better canonical resonance structure in case of the conjugate base of HNO3, we get 3 equivalent hybrid structures for NO3-.

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Answer 2

Group 15 elements are N/P/As/Sb which forms oxoacids. Except for N, others can form various types of oxo-acids with many oxidation states due to availability of “d” orbitals.

So as a comparison we take the most common +5 state for N and others too. The acidic strength follows the order: HNO3>H3PO4>H3AsO4>H3SbO4. This occurs due to the better canonical resonance structure in case of the conjugate base of HNO3, we get 3 equivalent hybrid structures for NO3-.

Thanks.

regards .........