Question

What is the name of the acid HClO3?

hydrochloric acid
hypochlorous acid
chloric acid
chlorous acid
Question 2(Multiple Choice Worth 2 points) What is the name of PbO?
lead oxide
lead (I) oxide
lead (II) oxide
lead (IV) oxide

Answer 1

I know number 2 is Lead (ll) oxide because I took the test and that is what I put as the answer and it was marked correct.

Answer 2

1) name of the acid HClO₃ is chloric acid. Oxidation number of hydrogen atom is +1, chlorine atom has oxidation number +5 and oxygen atom has oxidation number -2 (+1 + 5 - 3 · (-2) = 0).
2) name of PbO is lead(II) oxide. Lead atom has oxidation number +2 and oxygen atom has oxidation number -2 (+2 - 2 = 0).