Redox

     In the reaction Zn + H₂O --> ZnO₂ + H₂
 which element, if any, is oxidized? 

• Zinc
• Hydrogen
• Oxygen
• None

What substance is oxidized in the following reaction?
4Fe + 3O₂ --> 2Fe₂O₃

• Iron
• Fluorine
• Oxygen

If in a reaction, copper is reduced; its number of electrons has:

• Increased
• Decreased
• Remained Constant
• Varies Randomly

What element is being Oxidized?

• N

• H

• O

• S

What is the oxidation number of N in NO₂^-1?

• -3

• +4

• -2

• +3

What is oxidation number of H in CaH₂?

• +1
• -1
• 0
• +2

What is the reducing agent of this reaction?
3Mg + N₂−−−−> Mg₃N₂

• Mg
• N₂
• Mg₃N₂
• MgN

Which of the following half reactions correctly represents a reduction half reaction?

• Fe →Fe²⁺ + 2e^-
• Pb⁴⁺ + 2e^- →Pb²⁺
• 2O^-2 →O₂ + 4e^-
• Fe + 3e^- →Fe³⁺

What is the oxidizing agent of this reaction?
2Al_(s) + 6H⁺_(aq) −−−> 2Al³⁺ _(aq) + 3H_2(g)

• H₂
• Al³⁺
• Al
• H⁺

Which of these is not a redox reaction?

• Cu₂O + H₂SO₄ ⟶ CuSO₄ + Cu + H₂O

• MgO + 2HCl ⟶ MgCl₂ + H₂O

• SnCl₂ + HgCl₂ ⟶ Hg + SnCl₄

• MnO₂ + 4HCl ⟶ MnCl₂ + 2H₂O + Cl₂