Redox Review25Q

What is the oxidation number of chlorine in HClO?

• 0

• -1

• +1

• +5

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

The sum of the oxidation numbers in SCN^- is equivalent to

• 0

• -1

• +1

• +3

Determine the oxidation number of chromate in CrO₄^2-.

• +6

• 0

• +2

• +3

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

which element, if any, is oxidized?

• Zinc

• Hydrogen

• Chlorine

• None

Tags

NGSS.HS-PS1-2

Which statement is true:
Mg → Mg²⁺ + 2e^–

• Mg gains 2 electrons
• Mg_²⁺ loses 2 electrons
• Mg loses 1 electron
• Mg loses 2 electrons

Tags

NGSS.HS-PS1-2

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⁺

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is oxidation number of O in O₂ ?

• 0
• -2
• +1
• +2

Reduction happens at the 

• anode
• cathode
• salt bridge
• voltmeter

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⁺

Tags

NGSS.HS-PS1-7