Oxidation numbers Knowledge-Based Practice

Questions

1. 1.

   In which of the following compounds does sulfur exhibit an oxidation number of +4?

   • A) $\text{H}_2\text{SO}_4$
   • B) $\text{Na}_2\text{SO}_3$
   • C) $\text{FeS}_2$
   • D) $\text{SF}_6$
2. 2.

   What is the oxidation number of iron in potassium ferrate, $\text{K}_2\text{FeO}_4$?

   • A) +3
   • B) +6
   • C) +4
   • D) +2
3. 3.

   What are the oxidation numbers of the two nitrogen atoms in ammonium nitrate, $\text{NH}_4\text{NO}_3$, respectively?

   • A) -3 and +5
   • B) +1 and +1
   • C) +3 and +5
   • D) -3 and +3
4. 4.

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

   • A) +1
   • B) +3
   • C) +5
   • D) +7
5. 5.

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

   • A) +3
   • B) +5
   • C) +6
   • D) +7

Answers and step-by-step solutions appear after you finish the test.