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0.10g of a sample containing CuCo3 and s...

`0.10g` of a sample containing `CuCo_3` and some inert impurity was dissolved in dilute sulphuric acid and volume made up to `50mL`. This solution was added into `50mL` of `0.04MKI` solution where copper precipitates as `CuI and I^-` is oxidized into `I_3^-`. A `10mL` portion of this solution is taken for analysis, filtered and made up free `I_3^-` and then treated with excess of acidic permanganate solution. Liberated iodine required `20mL` of `2.5mM` sodium thiosulphate solution to reach the end point . Determine mass percentage of `CuCO_3` in the original sample.

A

7.41

B

74.1

C

61.75

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
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