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| 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 | |
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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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