If a solution X has a pH value of 2 and if another solution Y has a pH value of 1. Then compare the hydrogen ion concentration between them.
Solution Y has more hydrogen concentration than solution X
pH is a measure of hydrogen ion concentration in a solution. Higher the hydrogen ion concentration, lower is the pH. Acids which give rise to more hydrogen ions are more acidic than the acids which give less hydrogen ions. Thus, lower the pH, higher is the acidic nature of the solution.
Thus, Y has more hydrogen ion concentration than X.