Saved Bookmarks
| 1. |
When triatomic gas `X_(3)` reacts with an excess of potassium iodide solution buffered with a borate buffer `(pH=9.2)` diatomix product `Y_(2)` is liberated which can be titrated agains a standard solution of sodium thiosulphate. This is a quantitative method for the estimation of `X_(3)` gas in the mxiture of `X_(3)` and `X_(2)` of some atom `X`. Select the incorrect statement?A. `Y_(2)` produces blue colour wilth starchB. `X_(2)` is thermodynamically stable as compared to `X_(3)`C. `Y_(2)` can produce brown colouration due to the presence of excess `KI`D. `X_(2)` and `X_(3)` both are colourless and odourless gases |
|
Answer» Correct Answer - D `X_(2)=O_(2), X_(3)=O_(3), Y_(2)=l_(2)` `2l^(-)+H_(2)O+O_(3) to 2OH^(-)+l_(2)+O_(2)` `l_(2)+2S_(2)O_(3)^(2-)to2l^(-)+S_(4)O_(6)^(2-)` `I_(2)+` Starch solution `to` Blue colouration `I_(2)+I^(-)` (excess) `to` Brown coloured `I_(3)^(-)` ion `O_(2)` is thermodynamically more stable as compred to `O_(3)` `O_(3)` is pale blue gas which has characteristic smell`. |
|