1.

Which of the following elements shows variable valency ?(1) Na (2) Mg (3) Fe (4) Zn

Answer»

Correct option: (3) Fe

Explanation:

Elements of d - block show more than one valency.

Iron (Fe) show variable valency because it is a d- block element.

Iron shows 2 & 3 valency i.e. Fe+2(ferrous) and Fe+3 (ferric)



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