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0.84g iron are containing X per cent of ...

`0.84g` iron are containing `X` per cent of iron was taken in a solution containg all the iron in ferrous state. The solution required `X ml` of a porassium dichromate soltuion for oxidation of iron content to ferric state. Calculate the strength of potassium dichromate solution.

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The correct Answer is:
`7.35 g//"litre"`
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