Question

Give 5 examples of redox reactions in terms of metals and non metals..

Answer 1

Redox Reactions 
(Oxidation - Reduction Reactions)

In these reactions, the valency (oxidation number) of the reactants change.

For example: 2Fe3+ + Sn2+ -> 2Fe2+ + Sn4+ (8+ each side of the equation)

The iron (iii) + tin (ii) have reacted to give iron (ii) + tin (iv) of course, this reaction is carried out in the presence of HCl (Hydrochloric Acid), but the oxidation reduction reaction is only between the iron (iii) and tin (ii).

Now, a redox reaction is the release and uptake of electrons.

So, the Fe3+ is reduced to Fe2+, and the Sn2+ is oxidisedto Sn4+.

For example: Fe (metal) + Cu2+ -> Fe2+ + Cu (metal)

Fe donates two electrons to the Cu2+ to form Cu (metal). The Fe lost 2 electrons, so is oxidised.

The Cu2+ gained 2 electrons, so is reduced (in itsvalency).

For Example: Zn + 2HCl -> Zn2+ + H2 +2Cl-

In this reaction Zn + 2H+ -> Zn2+ + H2 (the chlorine is not changed in its ion state, so is not oxidised or reduced).

Zn is oxidised to Zn2+ (loses 2 electrons)

H+ is reduced to H2 (gains 2 electrons)

H+ has an oxidation number (valency) of +1, and isreduced to an oxidation number (valency) of 0.

Answer 2

Answer:

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Explanation:

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