Which reactions are oxidation-reduction reactions? 1. fes(s) + 2hcl(aq) → h2s(g) + fecl2(g) 2. agno3(aq) + nacl(aq) → agcl(s) + nano3 3. 2c3h6(g) + 9o2(g) → 6co2(g) + 6h2o(g) 4. fe2o3(s) + 3co(g) → 2fe(l) + 3co2(g)

The correct answer is Option 3 and Option 4.

Explanation:

Redox reactions are termed as the reactions in which reduction and oxidation reactions occur simultaneously.

Reduction reactions are the ones where a substance gains electrons. The oxidation state of the substance gets reduced.

Oxidation reactions are the ones where a substance looses electrons. The oxidation state of the substance is increased.

Fro the given options:

Option 1:

This reaction is a type of double displacement reaction because exchange of ions takes place.

Option 2:

This reaction is a type of double displacement reaction because exchange of ions takes place.

Option 3:

On reactant side:

Oxidation state of Carbon = +2

Oxidation state of Oxygen = 0

On product side:

Oxidation state of Carbon = +4

Oxidation state of Oxygen = -2

Here, oxidation state of carbon is increasing from +2 to +4. Thus, it is getting oxidized and oxidation state of oxygen is getting reduced from 0 to -2. Thus, it is getting reduced.

Option 4:

On reactant side:

Oxidation state of Iron = +3

Oxidation state of Carbon = +2

On product side:

Oxidation state of Iron = 0

Oxidation state of Carbon = +4

Here, oxidation state of carbon is increasing from +2 to +4. Thus, it is getting oxidized and oxidation state of iron is getting reduced from +3 to 0. Thus, it is getting reduced.

Hence, the correct answer is Option 3 and Option 4.

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mixture , because iron gets attracted to magnet .

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