Solubility of $AgCN$ is maximum in :
A.Acidic buffer solution
B.Basic buffer solution
C.In pure water
D.Equal in all solution

Hint:As we know, a buffer is an aqueous solution that consists of a mixture of weak acid as well as its salt/acid buffer or weak base with its salt/basic buffer. Its $pH$ changes very little when a small amount of strong acid or base is added to it as well as it is thus used to prevent solutions $pH$ change.

Complete step-by-step answer: A buffer is a solution that could tolerate $pH$ change when acidic or basic components are applied. It could neutralize a small amount of ad acid or base and retain a fairly steady $pH$ of solution. This is important for processes or reactions where unique as well as stable $pH$ ranges are needed.
Solutions with stable concentration of hydrogen ion as well as typically with no change in $pH$ which is almost independent from dilution along with change very little with little addition of strong acid/alkali are called buffers. It could also be described in simple terms as a solution which prevents any $pH$ change when a small amount of strong acid or strong base is applied to its called buffer solution or simply as buffer both buffers have acidity as well as alkalinity balance.
\[AgCN+HA\to HCN~\] Due to these reactions, the reaction shifts forward as well as the solubility of \[AgCN\] increases. So \[AgCN\] has maximum solubility in buffer solutions.

Therefore, Option A is correct option i.e. solubility of $AgCN$ is maximum in Acidic buffer solution.

Note:Note that the fluid within cell as well as fluid around cell have characteristic as well as almost constant $pH$ with all multicellular organisms. This $pH$ is preserved in a number of ways, along with one of the most important is through the buffer system. The acidity of the solution in which they occur affects a lot of chemical reactions. The $pH$ of the reaction medium should be controlled for the given reaction to occur at rate.