Home
Class 12
CHEMISTRY
Three reactions involving H(2)PO(4)^(-) ...

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?

A

(i) only

B

(ii) only

C

(i) and (ii)

D

(iii) only

Text Solution

Verified by Experts

The correct Answer is:
B
Only in reaction (ii) `H_(2)PO_(4)^(-)` gives `H^(+)` to `H_(2)O` and therefore it reacts as an acid.
Promotional Banner

Topper's Solved these Questions

  • IONIC EQUILIBRIUM

    DINESH PUBLICATION|Exercise LINKED COMPREHENSION TYPE MCQs|16 Videos

  • IONIC EQUILIBRIUM

    DINESH PUBLICATION|Exercise MATRIX MATCH TYPE MCQs|3 Videos

  • IONIC EQUILIBRIUM

    DINESH PUBLICATION|Exercise SELECTED STRAIGHT OBJECTIVE TYPE MCQs|10 Videos

  • HYDROCARBONS

    DINESH PUBLICATION|Exercise All Questions|493 Videos

  • NO IDEA

    DINESH PUBLICATION|Exercise Unit Test -|1 Videos

Similar Questions

Explore conceptually related problems

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 ?

Ca_(3)(PO_(4))_(2) +H_(2)SO_(4) to

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

For, H_(3)PO_(4)+H_(2)OhArrH_(3)O^(+)+H_(2)PO_(4)^(-), K_(a_(1)) H_(2)PO_(4)+H_(2)OhArrH_(3)O^(+)+HPO_(4)^(2-), K_(a_(2)) HPO_(4)^(2-)+H_(2)OhArrH_(3)O^(+)+PO_(4)^(3-), K_(a_(3)) The correct order of K_(a) values is:

H_(3)PO_(2)+AgNO_(2) to Ag darr+H_(3)PO_(4)+NO

DINESH PUBLICATION-IONIC EQUILIBRIUM -MCQs with only one correct Answer
  1. The following equilibrium is established when hydrogen chloride is dis...

    Text Solution

    |

  2. The pK(a) of HCN is 9.30. The pH of a solutin prepared by mixing 2.5 m...

    Text Solution

    |

  3. If pK(b) for fluoride ion at 25^(@)C is 10.83, the ionisation constant...

    Text Solution

    |

  4. The solubility of A(2)X(2) is x mole dm^(-3). Its solubility product i...

    Text Solution

    |

  5. The pH of 0.1 M solution of the following salts increases in the order

    Text Solution

    |

  6. H(3)BO(3) is :

    Text Solution

    |

  7. A solution is 10^(-3) M each in Mn^(2+),Fe^(2+),Zn^(2+) and Hg^(2+) is...

    Text Solution

    |

  8. A weak acid HX has the dissociation constant 1 xx 10^(-5)M. It forms a...

    Text Solution

    |

  9. 0.1 mole of CH(3)NH(2) (K(b)=5xx10^(-4)) is mixed with 0.08 mole of HC...

    Text Solution

    |

  10. The hydrogen ion concentration of a 10^(-8) M HCl aqueous soultion at ...

    Text Solution

    |

  11. 40 ml of 0.1 M ammonia is mixed with 20 ml of 0.1 M HCI. What is the p...

    Text Solution

    |

  12. A weak acid, HA, has a K(a) of 1.00xx10^(-5). If 0.100 mol of the acid...

    Text Solution

    |

  13. Which one of the following ionic species has the greatest proton affin...

    Text Solution

    |

  14. The pK(a) of a weak acid (HA) is 4.5. The pOH of an aqueous buffered s...

    Text Solution

    |

  15. In a saturated solution of the spatingly soluble strong electrolyte Ag...

    Text Solution

    |

  16. When 2.5 mL of 2//5M weak monoacidic base (K(b) = 1 xx 10^(-12) at 25^...

    Text Solution

    |

  17. The solubility product constant (K(sp)) of salts of types MX, MX(2), a...

    Text Solution

    |

  18. The ionization constant of ammonium hydroxide is 1.77xx10^(-5) at 298 ...

    Text Solution

    |

  19. The dissociation constants for acetic acid and HCN at 25^(@)C are 1.5x...

    Text Solution

    |

  20. Three reactions involving H(2)PO(4)^(-) are given below I. H(3)PO(4...

    Text Solution

    |