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