Oxidation Reduction Reactions

Which of the following has an oxidation number of zero on the chlorine atom?

• NaCl

• Cl₂

• Cl^-

• ClO₃^-

What is the oxidation number on the nitrogen in NO?

• 0

• -1

• -2

• +2

Tags

NGSS.HS-PS1-2

Determine the oxidation number of the selected element in each ion/ compound.

a) N in N₂O₄

b) Cr in CrO₄ ^2-

c) I in IO₃^-

• +8, -6, +5

• +2, +8, +6

• +4, +6, +5

• -4, -6, -5

• -4, -8, -6

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Find the oxidation number of S in S₂O₄ ^2-

• +3

• +6

• -6

• -3

• -4

Which species contains nitrogen with the highest oxidation state?

• NO₃⁻

• NO₂⁻

• NO₂

• N₂O

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Oxidation is the _________ of electrons.

• loss

• gain

• sharing

• transfer

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

Which represents a reduction?

• SO₃ to SO₄²⁻

• Mn₂O₃ to MnO₂

• H₂O₂ to OH⁻

• CrO₄²⁻ to Cr₂O₇²⁻

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In a redox reaction, the species reduced

• gains electrons and is the oxidizing agent

• loses electrons and is the oxidizing agent

• loses electrons and is the reducing agent

• gains electrons and is the reducing agent

Tags

NGSS.HS-PS1-1

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

NGSS.HS-PS1-7