Aqueous solution of sodium phosphate is

Explanation

The aqueous solution of sodium phosphate is basic. This is because sodium phosphate is the salt of a strong base (sodium hydroxide, NaOH) and a weak acid (phosphoric acid, H3PO4). In water, sodium phosphate dissociates to produce hydroxide ions (OH-), making the solution basic. Option A is incorrect because an acidic solution results from the presence of excess hydrogen ions (H+), which is not the case here. Option C is incorrect as a neutral solution has a pH of 7, which sodium phosphate does not achieve. Option D is incorrect because sodium phosphate does not exhibit amphoteric properties in solution.