Oxidation Reactions

In the reaction

4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

the oxidation number of nitrogen changes from

• –2 to –3

• –2 to +3

• –3 to –2

• –3 to +2

Tags

NGSS.HS-PS1-7

What is the oxidation number of chromium in K₂Cr₂O₇ ?

• +12

• +2

• +3

• +6

In which substance does hydrogen have an oxidation number of zero?

• LiH

• H₂O

• H₂S

• H₂

In which substance is the oxidation number of Cl equal to +1?

• Cl₂

• Cl₂O

• AlCl₃

• HClO₂

What is the oxidation state of phosphorus in the

compound Na₃PO₃?

• 0

• -3

• +3

• +5

Given the reaction:

Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)

The oxidation number of Zn(s) increases because it

• loses electrons

• gains electrons

• loses protons

• gains protons

Tags

NGSS.HS-PS1-2

Which change in oxidation number represents reduction?

• –1 to +1

• –1 to –2

• –1 to +2

• –1 to 0

In a redox reaction, the species reduced

• gains electrons and is the oxidizing agent

• gains electrons and is the reducing agent

• loses electrons and is the oxidizing agent

• loses electrons and is the reducing agent

In the reaction

2 Mg + O₂ → 2 MgO

the magnesium is the

• oxidizing agent and is reduced

• oxidizing agent and is oxidized

• reducing agent and is reduced

• reducing agent and is oxidized

Which balanced equation represents an oxidation-reduction reaction?

• AgNO₃ + NaCl → AgCl + NaNO₃

• BaCl₂ +K₂CO₃ → BaCO₃ +2KCl

• CuO + CO → Cu + CO₂

• HCl + KOH → KCl + H₂O

Tags

NGSS.HS-PS1-7