Redox reactions

What is the oxidation number of chlorine in HClO?

• 0

• -1

• +1

• +5

In the reaction Zn + 2HCl --> ZnCl₂ + H₂

which element, if any, is reducing agent?

• None

• Hydrogen

• Chlorine

• Zinc

What is the oxidation number of iodine in KIO₃?

• 0

• -1

• +5

• +1

Which of the following is not a reduction.

• C → CH₄

• Fe³⁺ → Fe²⁺

• Cl₂ → 2Cl^-

• Zn → ZnO

Which statement is true:
Mg → Mg²⁺ + 2e^–

• Mg gains 2 electrons
• Mg_²⁺ loses 2 electrons
• Mg loses 1 electron
• Mg loses 2 electrons

Which of the following half reactions correctly represents a reduction?

• Fe →Fe²⁺ + 2e^-

• Pb⁴⁺ + 2e^- →Pb²⁺

• 2O^-2 →O₂ + 4e^-

• Fe + 3e^- →Fe³⁺

What is oxidation number of H in CaH₂?

• +1
• -1
• 0
• +2

Which element is oxidized?

H₂S + Cl₂ → 2HCl + S

• H

• S

• Cl

• Not a redox reaction

What element is being reduced?

I₂ + H₂SO₃ + H₂O --> 2 HI + H₂SO₄

• I

• H

• S

• O

What is the oxidation number of C in SrCO₃?

• -4

• +2

• -6

• +4