Question : An acid having basicity 1 is
Option 1: Sodium dihydrogen phosphate
Option 2: Disodium hydrogen phosphate
Option 3: Sodium phosphate
Option 4: Phosphoric acid
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Correct Answer: Disodium hydrogen phosphate
Solution : The correct option is Disodium hydrogen phosphate .
The acid with the basicity one is disodium hydrogen phosphate (Na 2 HPO 4 ), which has one interchangeable hydrogen ion. Because phosphoric acid (H 3 PO 4 ) has three interchangeable hydrogen ions, it can supply three H+ ions in a chemical process. Sodium dihydrogen phosphate (NaH 2 PO 4 ) can donate two hydrogen ions, whereas sodium phosphate (Na 3 PO 4 ) has no hydrogen ion to donate.
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