Q.

An acid having basicity one is -

A. Sodium dihydrogen phosphate
B. Disodium hydrogen phosphate
C. Sodium phosphate
D. Phosphoric acid
Answer» B. Disodium hydrogen phosphate
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 ex-ample, 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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