Question

In the following, redox reactions
identify the substance oxidised, substance reduced, oxidising agent and reducing agent.
a) 4Fe +30₂ → 2Fe2O3
b) 2Ca + O2 → 2CaO
c) Mg + 2HCL → MgCl2 + H2
d) 2Na + 2H2O → 2NaOH + H2​

Answer 1

Explanation:

4Fe+3O

2

⟶2Fe

2

O

3

↓↓

00⟵ ( Oxidation no.)

In Fe

2

O

3

oxidation no. of Fe be x.

So, 2(x)+3(−2)=0

x=3

I) Oxidation no. of Fe changes from 0 to +3. So, it is oxidised. Oxygen made it to oxidise. So, Oxygen is the oxidising agent here.

I) Oxygen reduced here from 0 to −2. So, oxidising agents become reduced during chemical reactions.