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  1. An acid having basicity one is

    2. A.

     Sodium dihydrogen phosphate
    B.

     Disodium hydrogen phosphate
    C.

     Sodium phosphate
    D.

     Phosphoric acid

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    Answer : Option B

    Explanation :

    The basicity of an acid is the number of hydrogen ions (H+) which can be produced by the ionization of one molecule of the acid in aqueous solution. For example, the basicity of hydrochloric acid is 1 since one molecule of HCl produces one H+ ion in solution. Similarly, the basicity of Disodium phosphate (Na2HPO4) is one since it has one H+ displaceable ion.

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