The active agent in many hair bleaches is hydrogen peroxide. The amount of H2O2 in 14.8 g of hair bleach was determined by titration with a standard potassium permanganate solution: 2MnO4-(aq) 5H2O2(aq) 6H (aq) -> 5O2(g) Mn2 (aq) 8H2O(l) If 43.2 mL of 0.105 M KMnO4 was needed to reach the endpoint, what the mass % of H2O2 in the sample of hair bleach

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

it's all four options.

catya that's not even a b or c