Oxidation numbers Knowledge-Based Download PDF

Questions

1. 1.

   What is the oxidation number of chromium in the dichromate ion, $\text{Cr}_2\text{O}_7^{2-}$?

   • A) +3
   • B) +6
   • C) +7
   • D) +12
2. 2.

   What is the oxidation number of phosphorus in the dihydrogen phosphate ion, $\text{H}_2\text{PO}_4^-$?

   • A) +3
   • B) +5
   • C) +6
   • D) -3
3. 3.

   What is the oxidation number of oxygen in oxygen difluoride ($\text{OF}_2$)?

   • A) $-2$
   • B) $-1$
   • C) $+1$
   • D) $+2$
4. 4.

   In which of the following compounds does nitrogen have an oxidation number of +3?

   • A) $\text{NO}_2$
   • B) $\text{HNO}_3$
   • C) $\text{HNO}_2$
   • D) $\text{NH}_3$
5. 5.

   What is the oxidation number of manganese in the permanganate ion, $\text{MnO}_4^-$?

   • A) +2
   • B) +4
   • C) +7
   • D) +6