Redox Practice

What element is being Oxidized?

• N
• H
• O
• S

Is calcium oxidized or reduced in the following reaction? 
2 CaO--> 2 Ca + O₂

• Oxidized
• Reduced

What is the oxidation number of chlorine in HClO?

• 0

• -1

• +1

• +5

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

What is the oxidation number of iodine in KIO₃?

• 0

• -1

• +5

• +1

Which of the following represents oxidation?

• C → CH₄

• Fe³⁺ → Fe²⁺

• Cl₂ → 2Cl^-

• Zn → ZnO

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

which element, if any, is oxidized?

• Zinc

• Hydrogen

• Chlorine

• None

In the reaction
2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

• Reduced
• Synthesized
• Oxidized
• None of the above

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