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1.249 g of a sample of pure BaCO(3). and...

`1.249` g of a sample of pure `BaCO_(3).` and impure `CaCO_(3)` containing some CaO was treated with dil . HCl and it evoled 168 ml of `CO_(2)` at NTP . From this solution , `BaCrO_(4)` was precipitated , filtered and washed . The precipitate was dissolved in dilute sulphauric acid and diluted to 100 ml. 10 ml of this solution , when treated with Kl solution , liberated iodine which required exactly 20 ml of `0.05` ml of `0.05 N Na_(2)S_(2)O_(3)`. Calculate the percentage of CaO in the sample.

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The correct Answer is:
`14.09%`
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