Oxidation and reduction reactions

What is the oxidation number assigned to manganese in KMnO₄?

• ⁺7

• ⁺2

• ⁺4

• ⁺3

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

- What is the oxidation number of chromium in K₂Cr₂O₇

• +6

• +3

• +5

• +2

Given the electrochemical cell reaction:

 Zn_(s) + Ni²⁺ _(aq) → Zn²⁺ _(aq) + Ni_(s)

Which species is the reducing agent?

• Ni²⁺

• Zn

• Ni

• Zn²⁺

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-PS1-2

What element is an oxidizing agent?

• Na

• Ca

• K

• a. F₂

Another name for a "oxidation-reduction" reaction is

• chemical reaction
• neutralization reaction
• redox reaction
• nuclear reaction

Oxidation is the _________ of electrons.

• loss

• gain

• sharing

• transfer

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

Gaining oxygen is an example of...

• oxidation

• reduction

Tags

NGSS.HS-LS1-7

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