Example #1: What is the oxidation state of Cl in HCl?
Example #2: What is the oxidation state of Na in Na2O?
Example #3: What is the oxidation state of Cl in ClO¯?
Example #4: What is the oxidation state of Cl in ClO2¯?
Example #5: What is the oxidation state of Cl in ClO3¯?
Example #6: What is the oxidation state of Cl in ClO4¯?
Example #7: What is the oxidation state of S in SO42¯?
Example #8: What is the oxidation state of S in SO32¯?
Example #9: What are the oxidation states in KCl?
Example #10: What is the oxidation state for each element in NaMnO4?
Example #11: What is the oxidation state of N and of P in NH4H2PO4?
Example #12: For H2O2, is the oxidation state for O2, −2 or −4?
Example #13: For Fe3O4, is the oxidation state for O4, −2 or −8?
Example #14: Determine the oxidation state for I in I3¯.
Example #15: What is the oxidation state of silver in Ag2F (silver subfluoride)?
Example #16: What is the oxidation state of tungsten in tungsten disulfide, WS2?
Example #17: What is the oxidation state of manganese in LiMnO2?
Example #18: Give the oxidation states of the elements in the following compounds.
(a) ClO2 (b) XeF2 (c) CO (d) OF2 (e) O2F2 (f) Bi2O5 (g) MnO2 (h) Mn2O4
Example #19: What is the oxidation state of each of the following:
(a) Se in SeO32¯ (b) I in H5IO6 (c) S in Al2(SO3)3 (d) N and C in HCN (e) Cu in Na3[CuCl5]
Example #20: Find the oxidation state of chlorine in:
(a) ClO (e) ClF5 (i) Cl2O2 (chlorine peroxide) (b) ClO2 (f) ClOF3 (j) Cl2O4 (chlorine perchlorate) (c) ClF (g) Cl2O6 (k) ClN3 (d) ClF3 (h) Cl2O7 (ℓ) Cl2
Bonus Example: Find the oxidation state of nitrogen in:
(a) NO3¯ (e) N2O (i) N2O4 (b) N2H4 (f) NO (j) N2O3 (c) NO2+ (g) NO2¯ (k) N3¯ (d) N2O5 (h) NO2 (ℓ) N2
Problem #1: What is the oxidation state of carbon in calcium oxalate?
Problem #2: C in CO32¯
Problem #3: Cr in CrO42¯
Problem #4: Cr in Cr2O72¯
Problem #5: Fe in Fe2O3
Problem #6: Pb in PbOH+
Problem #7: V in VO2+
Problem #8: V in VO2+
Problem #9: Mn in MnO4¯
Problem #10: Mn in MnO42¯
Hydrides are compounds of a metal and hydrogen. What are the oxidation states of the elements present in each formula given in 11-13?
Problem #11: NaH
Problem #12: CaH2
Problem #13: SH6
Peroxides have the polyatomic ion O22¯ present. Two problems:
Problem #14: H2O2
Problem #15: CaO2
Bonus Problem: What is the oxidation state of Re in potassium nonahydridorhenate, which has the formula K2ReH9
Problem #16: HIO3, the iodine has an oxidation state of:
Problem #17: S2O32¯, thiosulfate:
Problem #18: What is the oxidation state of all free elements? Another way to ask this is to say that the elements are in their uncombined state.
Problem #19: Determine the oxidation state of P in P2O5.
Problem #20: Determine the oxidation state of S in Al2S3.
Problem #21: Determine the oxidation state of Te in Sc2Te3.
Problem #22: Determine the oxidation state of Si in SiF62¯.
Problem #23: All monatomic ions have oxidation states equal to the ______.
(a) difference of protons and electrons
(b) number of protons
(c) number of electrons
(d) difference of protons and neutrons
Problem #24: On rare occasions, oxidation states do not have to be whole numbers. Determine the oxidation state for S in S4O62¯.
Problem #25: What are the oxidation states for each Mn in Mn3O4? For each Fe in Fe3O4?
Problem #26: In which compound does hydrogen have an oxidation state of −1?
(a) NH3
(b) KH
(c) HCl
(d) H2O
Problem #27: In which compound does oxygen have an oxidation state of −1?
(a) O2
(b) H2O2
(c) H2O
(d) OF2
(e) KO2
Problem #28: Superoxide is not commonly mentioned in introductory chemistry classes. It is the polyatomic ion O2¯. KO2 is the most well-known of the superoxides. What are the oxidation states on each oxygen in the superoxide anion?
Problem #29: Some chemical compounds have one (or more) atoms in them where the oxidation state is zero. An example of this is glucose, C6H12O6.
Problem #30: What is the oxidation state of P in HPO42¯?
Problem #31: What is the oxidation number of rhenium in Ca(ReO4)2?
Problem #32: For which substance is the oxidation number of vanadium the same as that in the VO3¯ anion?
(a) VN (b) VCl3 (c) VOSO4 (d) VF5
Problem #33: What is the oxidation number of Mo in MoO2Cl2?
Problem #34: In which species does sulfur have the lowest oxidation state?
(a) SCl2 (b) OSF2 (c) H2SO3 (d) SF6
Problem #35: What is the oxidation number of carbon in CH2Cl2?
Problem #36: Chlorine is in a +1 oxidation number in:
(a) HCl (b) HClO4 (c) ICl (d) Cl2O
Bonus Problem: What is the oxidation state and coordination number of rhodium in the coordination compound K[RhCl(OH)(C2O4)2] ⋅ 6H2O?