The strength of the oxyacids decreases in the following order
A
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B
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C
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D
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Solution
The correct option is A Since all the elements are in the same oxidation state, electronegativity has to be considered. Electronegativity of the elements from N to Sb decreases generally. Thus N with high Electronegativity can donate the proton easily where as for Sb with least Electronegativity becomes difficult to donate proton. Thus (A) is the correct order.