A scientist while working on an experiment found a new compound X.

He represented the compound X as $F e (H C O_{3})_{3}$ .What is the valency of Fe(Iron)?

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Solution

The correct option is A 16
In Fe(HCO₃)₃
Bicarbonate ion ( $H C O_{3}^{-}$ ) specifically has -1 charge on it and $H C O_{3}$ is multiplied by 3 outside the bracket.The valency is the combining capacity of an element,so it implies that 3 bicarbonate ions will be attached to the iron.Therefore,the valency of iron is 3.

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A scientist while working on an experiment found a new compound X.

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