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A mixture of FeO and Fe(2)O(3) is compl...

A mixture of FeO and `Fe_(2)O_(3)` is completely reacted with 100 mL of 0.25 M acidified `KMnO_(4)` solution. The resultant solution was then treated with Zn dust which converted `Fe^(3+)` of the solution to `Fe^(2+)`.The `Fe^(2+)` required 1000 mL of 0.10 `MK_(2)Cr_(2)O_(7)` solution. Find out the weight % `Fe_(2)O_(3)` in the mixture.

A

80.85

B

19.15

C

50

D

89.41

Text Solution

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The correct Answer is:
A
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A mixture of FeO and Fe_(2)O_(3) is reacted with acidified KMnO_(4) solution having a concentration of 0.2278 M, 100 ml of which was used. The solution was then titrated with Zn dust which converted Fe_(2+) of the solution to Fe^(2+) . The Fe^ (2+) required 1000 ml of 0.13 M K_(2)Cr_(2) O_(7) solution. Find the % of FeO & Fe_(2)O_(3) .

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