Question

define variable valency.state the variable valencies exhibited by iron . Mention the chemical names of oxides of iron.​

Answer 1

Answer:

Elements combine with other atoms, donating, accepting or sharing electrons in different proportions depending on the nature of the reaction is called variable valency.

For example: Iron combines with oxygen to form ferrous oxide as well as ferric oxide .

Answer 2

Valency is the combining capacity of an element to complete it's valence shell. Some elements have different capacity to combine with other elements depending on the nature of the reaction, this is known as variable valency.

Iron = +2 and +3

Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO) the rarer form, and iron(II,III) oxide (Fe3O4) which naturally as magnetite.