STATEMENT -1 : `H_(3)PO_(4)` is a tribasic acid.
and
STATEMENT -2 : In `H_(3)PO_(4)`, only two H-atoms are replaceable.

Asseration: Both H_(3)PO_(4) and H_(3)PO_(3) posses the same number of hydrogen atoms, but H_(3)PO_(4) os tribasic acid and H_(3)PO_(4) is dibasic. Reason: In oxoacids only those H -atoms are replaceable which are attached to O-atom .

(A): H_(3)PO_(3) and H_(3)PO_(4) are tribasic acids (R) : H_(3)PO_(3) has two replaceable H-atoms and H_(3)PO_(4) has three replaceable H-atoms

(A) H_(3)PO_(3) is dibasic acid and H_(3)PO_(4) is tribasic (R ) H_(3)PO_(3) has two replaceable H - atoms and H_(3)PO_(4) has three replaceable H - atoms

Statement-1 : H_(3)PO_(3) is a dibasic acid and shows reducing character. Statement-2 : H_(3)PO_(3) contains two OH- groups and one hydrogen atom directly attached to P atom.

Why is H_3PO_4 tribasic and H_3PO_3 dibasic?

Statement-1 : Both H_(3)PO_(3) and H_(3)PO_(4) have the same number of hydrogen atoms but H_(3)PO_(4) is a tribasic acid and H_(3)PO_(3) is a dibasic acid. Statement-2 : 1 mol of H_(3)PO_(3) is neutralised by 2 mol of NaOH while 1 mol of H_(3)PO_(4) is neutralised by 3 mol of NaOH

(A) H_(3)PO_(3) is tribasic acid (R ) Three H atoms are directly attached to P atom in a H_(3)PO_(3) molecule.

H_(3)PO_(4) is tribasic while H_(3)PO_(3) is dibasic. Explain.

Statement H_(3)PO_(3) is a dibasic acid and its salt Na_(2)PO_(3) does not exist. Explanation Being dibasic nature, only two H are replaceable.

Statement: H_(3)PO_(3) is dibasic and H_(3)PO_(4) s tribasic acid. H_(3)PO_(3) and H_(3)PO_(4) on reacting with D_(2)O gives HD_(2) PO_(3) and D_(3)PO_(4) respectively.