Three reactions involving H2PO4– are given below : i) H3PO4 + H2O → H3O+ + H2PO4– ii) H2PO4–+ H2O → HPO42- + H3O+ iii) H2PO4– + OH–→ H3PO4 + O2-In which of the following above H2PO4– act as an acid?

An acid is a material that loses protons and we can clearly see that, only in H2PO4– is donating a proton to water. Thus it acts as an acid.

An acid is a material that loses protons and we can clearly see that, only in H2PO4– is donating a proton to water. Thus it acts as an acid.

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Three reactions involving H₂PO₄^– are given below :
                    i) H₃PO₄ + H₂O → H₃O⁺ + H₂PO₄^–
                    ii) H₂PO₄^–+ H₂O → HPO₄^2- + H₃O⁺
                    iii) H₂PO₄^– + OH^–→ H₃PO₄ + O^2-
In which of the following above H₂PO₄^– act as an acid?

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i) and ii)

ii only

iii) only

i) only

answer is A.

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An acid is a material that loses protons and we can clearly see that, only in H₂PO₄^– is donating a proton to water. Thus it acts as an acid.

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