Oxidation State and Redox Reactions Quiz

Chlorine has an oxidation state of +3 in which compound?

• HClO

• HClO₂

• HClO₃

• HClO₄

Tags

NGSS.HS-PS1-2

What is the oxidation number of iodine in KIO₄?

• +1

• -1

• +7

• -7

What is the oxidation number of chromium in the chromate ion, CrO₄²⁻?

• +6

• +2

• +3

• +8

In which substance does phosphorus have a +3 oxidation state?

• P₄O₁₀

• PCl₅

• Ca₃(PO₄)₂

• KH₂PO₃

Given the lead-acid battery reaction: Pb + PbO₂ + 2 H₂SO₄ → 2 PbSO₄ + 2 H₂O, which electronic equation represents the half-reaction for the oxidation that occurs?

• Pb → Pb²⁺ + 2 e⁻

• Pb⁴⁺ + 4 e⁻ → Pb

• Pb²⁺ + 2 e⁻ → Pb

• Pb → Pb⁴⁺ + 4 e⁻

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Which particles are gained and lost during a redox reaction?

• electrons

• protons

• neutrons

• positrons

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

When a redox reaction occurs, there must be a transfer of what?

• electrons

• neutrons

• protons

• ions

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Which half-reaction correctly represents oxidation?

• Sn²⁺ + 2e⁻ → Sn⁰

• Sn⁴⁺ + 2e⁻ → Sn²⁺

• Sn²⁺ → Sn⁰ + 2e⁻

• Sn²⁺ → Sn⁴⁺ + 2e⁻

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

In a chemical reaction, as a species is oxidized, its oxidation number:

• decreases

• increases

• remains the same

In the reaction H₃O⁺ + OH⁻ → 2 H₂O, the oxidation number of oxygen:

• decreases

• increases

• remains the same