What if there is only one reactant or product?
Problem List

Example #1: ClO¯ ---> Cl¯ + ClO₃¯ [basic solution]

Example #2a: IO₃¯ + I¯ ---> I₂ [acidic solution]

Example #2b: IO₃¯ + I¯ ---> I₂ [basic solution]

Example #3: Cl₂ ---> Cl¯ + ClO₃¯ [basic solution]

Example #4: I₃¯ ---> I¯ + IO₃¯ [acidic sol.]

Example #5: P₄ ---> HPO₃²¯ + PH₃ [acidic solution]

Problem #1: P₄ + NaOH + H₂O ----> PH₃ + Na₂HPO₃

Problem #2a: Cl₂ ---> Cl¯ + ClO

Problem #2b: Cl₂ ---> Cl¯ + ClO¯

Problem #3: CaCl(ClO) ---> Cl₂ [acid solution]

Problem #4: S₈ + Na₂SO₃ + H₂O ---> Na₂S₂O₃ ⋅ 5H₂O

Problem #5: S₈ ---> S₂O₃^2- + S^2- [basic solution]

Problem #6: NH₃ + NO₂ ---> N₂

Problem #7: NO₂ ---> NO₃¯ + NO [acid solution]

Problem #8: Se --> Se²¯ + SeO₃²¯

Problem #9: K₂MnO₄ ---> MnO₂ + KMnO₄

Problem #10: C₂N₂ ---> CN¯ + CNO¯

Problem #11: HNO₂ ---> HNO₃ + NO + H₂O

Problem #12: ClO₂ ---> ClO₂¯ + ClO₃¯ [basic]

Problem #13: (CN)₂ ---> CN¯ + OCN¯ [basic solution]

Problem #14: P₄ ---> H₂PO₂^- + PH₃ [basic soln.]

Problem #15: Mn²⁺ + MnO₄¯ ---> MnO₂(s) [basic soln.]