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If Phosphorous acid, Tetrathionic acid a...

If Phosphorous acid, Tetrathionic acid and Pyrophosphoric acid have number of acidic hydrogen per molecule respectively as x,y and z, then find value of x+y-z

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Phosphorous acid `(H_3PO_3)` Dibasic `:.` x=2
Tetrathionic acid `(H_2S_4O_6)` Dibasic `:.` y=2
Pyrophosphoric acid `(H_4P_2O_7)` tetrabasic `:.` z=4
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