6. Chemical Quantities & Aqueous Reactions

In the compound $N_2{H}_4{O}_2$ (often written as $N_2{H}_4{O}_2$), nitrogen occurs in two different ions: $N_1^{+}$ in $N_1{H}_4$ and $N_1^{-}$ in $N_1{O}_2$. What are the oxidation numbers of nitrogen in these two ions (in the order $N_1{H}_4$ then $N_1{O}_2$)?

What is the oxidation number of magnesium in the compound MgCl_2?

Which choice correctly identifies the oxidation numbers (o.n.) for each element in Ca(NO3)2?

In the neutral compound chloric acid (HClO_3), what is the oxidation number of the chlorine atom?

What is the oxidation state of iodine in the ion IO_3^-?

What are the oxidation numbers of arsenic and oxygen in the arsenate ion, AsO_4^{3-}?

What is the oxidation number of barium (Ba) in the compound BaCl2?

Which of the following compounds contains an atom with the highest oxidation number?

What is the oxidation state of an individual sulfur atom in SO_4^{2-}?

What is the oxidation number of the sulfur atom in SO_4^{2-}?

What is the oxidation number of bromine (Br) in HBrO_3?

What is the oxidation state of chromium (Cr) in the compound K2Cr2O7?

In the reaction 16H^+ + 2Cr_2O_7^{2-} + C_2H_5OH → 4Cr^{3+} + 11H_2O + 2CO_2, which element is reduced?

What is the oxidation number of chlorine (Cl) in the compound NaClO3?

What is the oxidation state of an individual carbon atom in CaCO_3?