0.01 mole of is completely neutralised by 0.56 gram of KOH hence :

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Problem

0.01 mole of

H_3PO_x

is completely neutralised by 0.56 gram of KOH hence : (1)

x=3

and given acid is dibasic (2)

x=2

and given acid is monobasic (3)

x=3

and given acid is monobasic (4)

x=4

and given acid forms three series of salt