In the reaction Zn + CuSO₄ → Cu + ZnSO₄

The given question is incomplete. The complete question is:

In the reaction , identify the oxidizing and reducing agent.

 reducing agent. : Zn

oxidizing agent :

Explanation:

Oxidation reaction : When there is an increase in oxidation state number.

Reduction reaction : when there is a decrease in oxidation state number.

Zinc metal has undergone oxidation, as its oxidation state is changing from 0 to 2+. Zinc metal is getting converted into zinc ions.

ions has undergone reduction, as its oxidation state is changing from +2  to 0. Copper ions are getting converted into copper metal.

The chemical agent which itself get oxidized and reduce others is called reducing agent.   is a reducing agent.

The chemical agent which itself get reduced and oxidize others is called oxidizing agent. is an oxidizing agent.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons