Redox Review

What is the oxidation number on the nitrogen in NO?

• 0

• -1

• -2

• +2

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

• NaCl

• Cl₂

• Cl^-

• ClO₃^-

What is reduced in the reaction below?

Na + PbCl₂ → Pb + NaCl

• Na

• Pb

• Na⁺¹

• Pb²⁺

Tags

NGSS.HS-PS1-2

Oxidation is the _________ of electrons.

• loss

• gain

• sharing

• transfer

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-PS1-1

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⁺

What is the oxidation number of iodine in KIO₃?

• 0

• -1

• +5

• +1

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

• -3

• +4

• -2

• +3

What is the oxidation number of S in HSO₄^- ?

• +5

• -6

• +6

• +2

For the following example, identify the reducing agent:

H₂ + Cl₂ --> 2HCl

• H₂

• Cl₂

• both

• neither