The compound that gives hydrogen peroxide on treatment with a dilute cold acid is:

Na2O2+2H2O→H2O2+2NaOH (Sodium is displaced by hydrogen atoms).  PbO2,MnO2 And SnO2 are oxides, so displacing metal with hydrogen in these oxides lead to formation of water, whereas Na2O2 is peroxide so displacing sodium with hydrogen gives hydrogen peroxide.