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Potassium Permanganate

Number of mol...

Question

Number of moles of $C r_{2} O_{7}^{- 2}$ required to oxidise one mole of ferrous ion completely in acidic medium.

A

\frac{1}{2}

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B

\frac{1}{3}

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C

\frac{1}{6}

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D

\frac{1}{9}

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Solution

The correct option is C $\frac{1}{6}$

1 mole $C r_{2} O_{7}^{2 -}$ oxidises 6 moles of $F e^{+ 2}$
$\frac{1}{6}$ mole of $C r_{2} O_{7}^{2 -} 1$ mole of $F e^{+ 2}$

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