In the reaction (2 Fe2+ + H2O2 + 2 H+ -> 2 Fe3+ + 2 H2O), what is the role of H2O2 *

1-reducing agent

2-acid

3-oxidizing agent

4-base

Can someone me with questions 12 and 13 plz.

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.