The aqueous solution of NH₄CN is

Explanation

The aqueous solution of NH₄CN is basic. This is because when NH₄CN is dissolved in water, it dissociates into NH₄⁺ and CN⁻ ions. The NH₄⁺ ion is a weak acid and does not significantly contribute to the acidity of the solution. On the other hand, the CN⁻ ion is the conjugate base of the weak acid HCN and hydrolyzes in water to form OH⁻ ions, making the solution basic. Option B is correct. Option A is incorrect because the presence of CN⁻ ions causes the solution to be basic, not acidic. Option C is incorrect because the solution is not neutral due to CN⁻ hydrolysis. Option D is incorrect because the solution's basic nature is predictable based on the hydrolysis of the CN⁻ ion.