Question

The element which shows variable valency is-
(A) Calcium
(B) Zinc
(C) Magnesium
(D) Iron

Answer 1

Answer:

I am not confirm about the answer but according to me it might be zinc

Answer 2

Answer:

The element that shows variable valency is Iron

Explanation:

Iron exhibits variable valency in that it can combine with certain elements at different proportions depending on the reaction. This nature of iron causes it to have more than one valence in different reactions.

For instance iron reacts with oxygen to form either ferrous oxide or ferric oxide. When iron reacts with oxygen to form ferrous oxide it exhibits a valence of +2 (FeO) and when it forms ferric oxide it exhibits a valence of +3 (Fe₂O₃).

Elements that exhibit variable valency include transition metals like tin, nickel, iron and copper. Non metals that exhibit this behaviour include nitrogen and oxygen.