Redox Equations

In the reaction, Zn + H₂O --> ZnO₂ + H_2, which element, if any, is oxidized?

• Zinc

• Hydrogen

• Oxygen

• None

Which substance is reduced in the following reaction? 
NaOH + Li --> LiOH + Na

• Li
• Na
• O
• H

Which process involves the transfer of electrons?

• double replacement

• neutralization

• oxidation-reduction

• sublimation

Which of these equations represents a redox reaction?

• Ca(HCO₃)_{2 -->} CaCO₃ + H₂O + CO₂

• HC₂H₃O₂ + NaOH --> NaC₂H₃O₂ + H₂O

• Zn + 2FeCl₃ --> ZnCl₂ + 2FeCl₂

• NaCl + AgNO_{3 -->} AgCl + NaNO₃

Which element is oxidized?

H₂S + Cl₂ → 2HCl + S

• H

• S

• Cl

• Not a redox reaction

Which equations shows an oxidation reaction?

• A

• B

• C

• D

What are the oxidation numbers for NH₄Cl

• N: 3+   H: 1+   Cl: 1-
• N: 3-   H: 1+   Cl: 1+
• N: 3-   H: 1+   Cl: 1-
• cannot be determined

What element is being reduced?

I₂ + H₂SO₃ + H₂O --> 2 HI + H₂SO₄

• I

• H

• S

• O

Which element is being oxidized in the following chemical reaction?

2KMnO₄ + 5KNO₂ + 3H₂SO₄ --> 2MnSO₄ + 3H₂O + 5KNO₃ + K₂SO₄

• S

• Mn

• O

• N

Which element is reduced in the following reaction?

2K₂Cr₂O₇ + 2H₂O + 3S --> 3SO₂ + 4KOH + 2Cr₂O₃

• K

• Cr

• O

• S