Oxidation and Reduction (I)

In which species does sulfur have the same oxidation state as in SO₃^2–?

• A. S₂O₃^2–

• B. SO₄^2–

• C. H₂S

• D. SOCl₂

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Which is the species oxidized and the oxidizing agent in the reaction?

MnO₂ (s) + 4HCl (aq) → MnCl₂ (aq) + Cl₂ (g) + 2H₂O (l)

• A

• B

• C

• D

Which species contains nitrogen with the highest oxidation state?

• A. NO₃⁻

• B. NO₂⁻

• C. NO₂

• D. N₂O

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Which represents a reduction?

• SO₃ to SO₄²⁻

• Mn₂O₃ to MnO₂

• H₂O₂ to OH⁻

• CrO₄²⁻ to Cr₂O₇²⁻

Which equation shows oxygen undergoing reduction?

• 2F₂ + O₂ → 2F₂O

• Na₂O + H₂O → 2NaOH

• H₂O₂ + 2HI → 2H₂O + I₂

• 2CrO₄²⁻ + 2H⁺ ⇌ Cr₂O₇²⁻ + H₂O

Which coefficients correctly balance this redox equation?

aFe²⁺ (aq) + MnO₄⁻ (aq) + bH⁺ (aq) → cFe³⁺ (aq) + Mn²⁺ (aq) + dH₂O(l)

• A

• B

• C

• D

Which element has the same oxidation number in both species?

• C in C₂H₄ and CO₂

• H in H₂O and NaH

• S in SO₄²⁻and SO³

• O in H₂O₂ and H₂O

Which can describe oxidation?

• Loss of hydrogen

• Decrease in oxidation number

• Gain of electrons

• Loss of oxygen

Which product will be obtained at the anode (positive electrode) when molten NaCl is electrolysed?

• Na (l)

• Cl (g)

• Cl₂ (g)

• Na (s)

What are the products of electrolysis when molten calcium bromide is electrolysed using graphite electrodes?

• A

• B

• C

• D