Why does silver not displace hydrogen from an aqueous acid solution?

Silver does not displace hydrogen from an aqueous acid solution because it has a positive standard reduction potential (+0.7995 volt), making it inert toward the aqueous hydrogen ion.1

In chemistry, the ability of a metal to displace hydrogen from a strong acid depends on its reduction potential. By convention, the reduction potential of hydrogen is zero. Metals with negative reduction potentials are more easily oxidized than hydrogen and can, in principle, displace it from an acid solution. Conversely, silver is classified as a noble metal, a group characterized by low chemical reactivity and a strong resistance to oxidation due to stable electronic configurations. Because silver's reduction potential is positive, it lacks the chemical tendency to undergo the oxidation necessary to displace hydrogen ions from solution.12