Question

Explain with reason
Iron ion is an example of variable valency ​

Answer 1

Answer:

Iron and copper have variable valency because they show involvement of vacant d-orbitals and electrons from outermost and penultimate shells are involved in the reaction.

Answer 2

Answer:

The following table gives the names of some compounds with variable valencies of elements. Another example is iron has two electrons in its valence shell. On donating these electrons, its valency is +2. ... In such a situation the ion formed has +3 electropositive valency