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Three reaction involving H(2)PO(4)^(-) a...

Three reaction involving `H_(2)PO_(4)^(-)` are given below :
`(i) H_(3)PO_(4)+H_(2)O to H_(3)O^(+)+H_(2)PO_(4)^(-)`
`(ii) H_(2)PO_(4)^(-) + H_(2)O to HPO_(4)^(2-) + H_(3)O^(+)`
(iii) `H_(2)PO_(4)^(-)+OH^(-) to H_(3)PO_(4)+O^(2-)`
In which of the above does `H_(2)PO_(4)^(-)` act as an acid ?

A

ii only

B

I and ii

C

iii only

D

I only

Text Solution

Verified by Experts

The correct Answer is:
A

Hence only in (ii) reaction `H_(2)PO_(4)^(-)` is acting as an acid
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For H_(3)PO_(4) , H_(3)PO_(4) hArr H_(2)PO_(4)^(-) + H^(+) (K_(1)) H_(2)PO_(4)^(-) hArr HPO_(4)^(2-) + H^(+) (K_(2)) HPO_(4)^(2-) hArr PO_(4)^(3-) + H^(+) (K_(3)) then

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