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Three reactions involving H2PO4^- are gi...

Three reactions involving `H_2PO_4^-` are given below :
(P)`H_3PO_4+H_2O to H_3O^+ + H_2PO_4^(-)`
(Q)`H_2PO_4^(-) + H_2O to HPO_4^(2-)+H_3O^(+)`
(R) `H_2PO_4^(-)+OH^(-) to H_3PO_4 + O^(2-)`
In which of the above `H_2PO_4^(-)` acts as an acid ?

A

Q only

B

P and Q

C

R only

D

P only

Text Solution

Verified by Experts

The correct Answer is:
A
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Three reactions involving H_(2)PO_(4)^(-) are given below I. H_(3)PO_(4)+H_(2)OrarrH_(3)O^(+)+H_(2)PO_(4)^(-) II. H_(2)PO_(4)^(-)+H_(2)OrarrHPO_(4)^(2-)+H_(3)O^(+) III. H_(2)PO_(4)^(-)+OH^(-)rarrH_(3)PO_(4)+O^(2+) In which of the above does H_(2)PO_(4)^(-) act as an acid?

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

H_(4)underline(P_(2))O_(7)+H_(2)O to 2H_(3)PO_(4)

GRB PUBLICATION-IONIC EQUILIBRIUM-All Questions
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  2. The conjugate base of OH^(-) is :

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  3. Three reactions involving H2PO4^- are given below : (P)H3PO4+H2O to ...

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  5. In water, the acid HCIO(4), HCI, H(2)SO(4) and HNO(3) exhibit the same...

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  6. Which of the following is the strongest base ?

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  7. An acid with molecular formula C7H6O3 froms only three types of sodium...

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  8. Which of the following is a weak electrolyte in aqueous solution ?

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  9. H2CO3(aq)+H2O(l)toHCO3^-(aq) + H3O^+(aq) HCO3^(-)(aq) + H2O(l)to CO3...

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  10. Weak acid include which of the following ? (P)HF(aq) , (Q)HI(aq) , (...

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  11. Which is not a conjugate acid/base pair ?

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  12. What is the conjugate base of HSO4^- ?

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  13. When the acids, HCIO3, H3BO3, H3PO4 , are arranged in order of increas...

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  14. Which acid is the strongest ?

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  15. What is the conjugate acid of HPO4^(2-)?

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  16. Species acting as both Bronsted acid and base is:

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  18. Which of the following expression is not true ?

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  20. Hydrogen peroxide ionises as H2O2 hArr H^+ + HO2^- if pH of H2O2 is 5....

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