Which of the following is not a cation?

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Which of the following is not a cation?

Iron (III) ion
Mercurous ion


Answer: Option (b) is the correct answer.


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.

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