Question

Complete this half-reaction.

2Cr(s) → 2Cr3+(aq) + ____


2e-

3e-

4e-

6e-

Answer 1

2Cr(s) → 2Cr3+(aq) + 3e⁻

Step-by-step explanation:

• The complete half reaction is 2Cr(s) → 2Cr3+(aq) + 3e⁻
• The half reaction shows an oxidation reaction.
• Oxidation refers to the loss of electrons by an atom of an element.
• In this case, chromium atom undergoes oxidation by losing three electrons to form chromium ion.
• Additionally, the oxidation number has increased from 0 to +1 which makes it an oxidation reaction.