Chemistry 1: Redox Reactions

Which species functions as the oxidizing agent in the following oxidation-reduction reaction? Zn_(s) + Pt²⁺_(aq) → Pt_(s) + Zn²⁺_(aq)

• Pt_(s)

• Zn²⁺_(aq)

• Pt²⁺_(aq)

• Zn_(s)

• None of these, as this is not a redox reaction.

Which species gets oxidized in the following reaction? 2Ag⁺_(aq) + Zn_(s) → Zn²⁺_(s) + 2Ag_(s)

• Ag_(s)

• Ag+(aq)

• Zn²⁺_(aq)

• Zn_(s)

• None of these, as this is not a redox reaction

In the following reaction, which species is the oxidizing agent and which gets reduced? 2H⁺_(aq) + Mn_(s) → Mn²⁺_(aq) + H_2(g)

• H⁺ is the oxidizing agent and Mn gets reduced

• H⁺ is the oxidizing agent and H⁺ gets reduced

• Mn is the oxidizing agent and H⁺ gets reduced

• Mn is the oxidizing agent and Mn gets reduced

• Mn is the oxidizing agent and Mn²⁺ gets reduced

What is the oxidation number of each atom in H₃PO₄?

• H = -1; P = +5; O = -2

• H = 0; P = +3; O = -2

• H = +1; P = +7; O = -2

• H = +1; P = +1; O = -1

• H = +1; P = +5; O = -2

What is the oxidation number of each atom in sodium chlorate NaClO₃?

• Na = +1; Cl = +5; O = -2

• Na = +1; Cl = +7; O = -4

• Na = +1; Cl = +7; O = -2

• Na = +1; Cl = +3; O = -1

• Na = -1; Cl = +5; O = -2

What are the oxidation numbers of sodium and iodine in potassium triiodide, KI₃?

• K = +1; I = 0

• K = +1; I = -1

• K = -1; I = -3

• K = +1; I = -1/3

• K = +1; I = -2/3

Which of the following is a correctly balanced reduction half-reaction? Tick all that apply.

• Fe³⁺ + e^– → Fe

• 2Fe + 6HNO₃ → 2Fe(NO₃)₃ + 3H₂

• Mn²⁺ + 4H₂O → MnO₄^– + 8H⁺ + 5e^–

• O₂ + 2H⁺ + 2e^–→ 2H₂O

• Mg²⁺ + 2e^– → Mg

Balance the following reaction in acidic solution I^– + HNO₂ → NO + I₂

• H⁺ + HNO₂ + I^– → NO + I₂ + H₂O

• 2H⁺ + 2HNO₂ + I^– → 2NO + I₂ + 2H₂O

• 2H⁺ + 2HNO₂ + 2I^– → 2NO + I₂ + 2H₂O

• H⁺ + HNO₂ + 2I^– → 2NO + I₂ + 2H₂O

• H⁺ + HNO₂ + 2I^– → NO + I₂ + H₂O + e^–

Balance the following reaction in acidic solution I^– + HNO₂ → NO + I₂

• 2I^– + HNO₂ + H₂O + 5e^– → NO₂ + I₂ + 3H⁺

• I^– + HNO₂ + H₂O + 5e^– → NO₂ + I₂ + 3H⁺

• 2I^– + HNO₂ + H₂O + 4e^– → NO + I₂ + 3H⁺

• 2I^– + HNO₂ + H₂O + 5e^– → NO + I₂ + 3H⁺

After balancing the equation for the reaction in acidic media, what is the sum of ALL the coefficients in the equation?

• 22

• 30

• 32

• 36