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Standard XII

Chemistry

Borax

A solution co...

Question

A solution containing $F e^{2 +}$ ions is titrated with $K M n O_{4}$ solution. Indicator used will be:

phenolphthalein

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methyl orange

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litmus

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none of the above

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Solution

The correct option is C none of the above
Titration of ${F e}^{2 +}$ with ${K M n O}_{4}$ is an redox titration.
${F e}^{2 +} + 7 {M n O}_{4}^{-}      + 14 H^{+} = {F e}^{3 +} + 7 {M n}^{2 +}      + 7 H_{2} O$
violet colourless
So, phenolpthalein, methyl orange and litmus are all acid base indicators. They can't be used in this redox titration. ${K M n O}_{4}$ is a self-indicator changing from violet to colourless.
$∴$ Answer will be $D$ .

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ions is titrated with

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K M n O_{4}

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A solution containing Fe2+ ions is titrated with KMnO4 solution. Indicator used will be:

A solution containing $F e^{2 +}$ ions is titrated with $K M n O_{4}$ solution. Indicator used will be: