This question seems to be an essay question from experiment. Different solution of oxidizing agent will have different strength. Sulfuric acid or H2SO4 is weaker oxidizing agent when compared to nitric acid (HNO3). In this case, if you subtitute the H2SO4 you wouldn't be able to get the same result for the experiment.
Its obviously D like what are you stupid lol jk don’t take it to heart kid
3 covalent bonds (there are 2 electrons in the first orbital and 5 in the second. You still have room for three more)
399.195 millimeters=0.399195 liters