Redox quiz

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

Combustion and single-replacement reactions are __________ redox reactions.

• always

• never

• sometimes

• mostly

In a redox reaction, the oxidizing agent

• gains electrons and is oxidized

• loses electrons and is oxidized

• loses electrons and is reduced

• gains electrons and is reduced

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

• Reduced
• Synthesized
• Oxidized
• None of the above

In the reaction Zn + H₂O --> ZnO₂ + H₂

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

Oxidation states for

NaBr

• Na=+1, Br=-1

• Na=+1, Br=-7

• Na=+2, Br=-2

• Na=+1, Br=-2

Which are examples of reduction?

• I and II

• I and III

• II and III

• I, II and III

Oxidation state for

I₂

• I=-1

• I=0

• I=+7

• I=-2

When metals are extracted from ores, a __________ reaction is used.

• oxidation.
• reduction.
• extraction
• mining