Answer :
• Al --> Al3+ is an oxidation and 3 electrons on right side are needed.
Cu2+ --> Cu is a reduction and 2 electrons on left side are needed.
• 2 F- --> F₂ is an oxidation and 2 electrons on right side are needed.
In redox reaction, we can identify 2 kinds of half-reactions:
- Oxidation: the oxidation number increases.
- Reduction: the oxidation number decreases.
Let's consider following half-reactions.
• AI⇒ Al 3+
This is an oxidation because oxidation number increases from 0 to 3+. To balance it, we need 3 electrons on the right side.
Cu²+⇒ Cu
This is a reduction because oxidation number decreases from 2+ to 0. To balance it, we need 2 electrons on the right side.
• 2 F- ⇒ F₂
This is an oxidation because oxidation number increases from -1 to 0. To balance it, we need 2 electrons on the right side.
Al --> Al3+ is an oxidation and 3 electrons on the right side are needed.
Cu2+ --> Cu is a reduction and 2 electrons on the left side are needed.
2 F- ---> F2 is an oxidation and 2 electrons on the right side are needed.
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