InterviewSolution
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InterviewSolution
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Direct titration of `I_(2)` with a reducing agent is called iodimetry. If `I_(2)` is leberated by the oxidation of `I_(ɵ)` ion by a strong oxidising agent in neutral or acidic medium, the liberated `I_(2)` is then titrated with reducing agent. Iodometry is used to estimate the strngth of the oxidising agent. For example, in the estimation of `Cu^(2+)` with `S_(2)O_(3)^(2-)` `Cu^(2+)+I^(ɵ)toCuI_(2)+I_(2)` (iodometry) `I_(2)+S_(2)O_(3)^(2-)toS_(4)O_(6)^(2-)+I^(ɵ)` (iodimetry) Strach is used as an indicator at the end point, which forms bluecoloured complex with `I_(3)^(ɵ)` Disappearance of blue colourindicates the end point whe free `I_(2)` in not present. Q. The volume of KI solution used for `CuSO_(4)` is:A. 1LB. 2LC. 4LD. 5L |
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Answer» Correct Answer - C `1 mol CuSO_(4)-=1 mol S_(2)O_(3)^(2-)` `-=(1)/(2)mol I_(2)-=2 mol KI` `-=0.4xx2=0.8mol` `therefore0.2MxxV=0.8` `V=4L` |
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