When 2 grams of powdered lead (iv) oxide was added to 100 cm3 of hydrogen peroxide, water and oxygen were produced. lead (iv) oxide was not used up in the reaction. based on the information, which of the following is likely to decrease the rate of formation of the products? replacing the powdered lead oxide with its large crystals removing lead (iv) oxide from the reaction mixture using 50 cm3 of hydrogen peroxide using 1.0 gram of lead (iv) oxide