Which equation represents an oxidation-reduction reaction? 1.  ch4 + 2o2 → co2 + 2h2o 2.  h2so4 + ca(oh)2 → caso4 + 2h2o 3.  mgcro4 + bacl2 → mgcl2 + bacro4 4.  zn(no3)2 + na2co3 → 2nano3 + znco3?

The correct answer is Option 1.

Explanation:

For the given options:

This reaction is considered as combustion reaction and all the combustion reaction are redox reactions. In redox reaction, reduction and oxidation reactions occur simultaneously.

In this reaction, oxidation state of carbon is increasing from -4 to +4, so it is undergoing oxidation reaction and oxidation state of oxygen is decreasing from 0 to -2, so it is undergoing reduction reaction.

Thus, this is an oxidation-reduction reaction.

This reaction is considered as a neutralization reaction because in this an acid is reacting with a base to produce a salt and water molecule.

Thus, this is not an oxidation-reduction reaction.

This reaction is considered as a double displacement reaction because here exchange of ions takes place.

Thus, this is not an oxidation-reduction reaction.

This reaction is considered as a double displacement reaction because here exchange of ions takes place.

Thus, this is not an oxidation-reduction reaction.

From the above information, the correct answer is Option 1.

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