Which of the following is not a cation? iron (iii) ion sulfate ca²⁺ mercurous ion

Option (b) is the correct answer.

Explanation:

When a neutral element loses an electron then it acquires a positive charge and it is known as a cation.

For example, when a neutral iron atom loses three electrons then it forms a ion.

On the other hand, when a neutral element gains an electron then it acquires a negative charge and it is known as a anion.

For example, a sulfate ion means ion.

Thus, we can conclude that out of the given options sulfate is not a cation.

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being