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B
Orthophosphoric acid (H3PO4)
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C
Pyrophosphoric acid (H4P2O7)
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D
Hypophosphoric acid (H4P2O6)
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Solution
The correct option is D Hypophosphorous acid (H3PO2) Hypophosphorous acid (H3PO2) has one replaceable hydrogen. The hydrogen attached to P does not contribute to the acidity in acids.