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A solid nonmetal A on exposure to air fo...

A solid nonmetal A on exposure to air forms a compound B which on dissolution in water forms the highest oxy acid C. Identify different type of salts which can be formed when C reacts with caustic potash

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`4P+5O_2rarr2P_2O_5`
`A" "B`
`P_2O_5+2H_2Orarr2H_3PO_4`
`A" "B`
`H_3PO_4+KOHrarrKH_2PO_4+H_2O`
`H_3PO_4+KOHrarrK_2HPO_4+2H_2O`
`H_3PO_4+3KOHrarrK_3PO_4+3H_2O`
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