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InterviewSolution
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Which of the following reactions describes the decomposition of potassium chlorate?A. `KCIO_(3)rarrKCl+O_(2)`B. `KCIO_(3)rarrK_(2)O+Cl_(2)`C. `KCIO_(3)rarrKCIO_(4)+KCl`D. Both (1) and (3) |
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Answer» Correct Answer - 4 Chlorates decompose on heating `KCIO_(3)` may decompose in two different ways .Depending on the temperature. Heating `KCIO_(3)` to `400-500^(@)C` is well known laboratery experiment to produce dioxygen .It also gives a trace to `CI_(2)` or `CIO_(2)`. Decomposition occurs at `150^(@)C` if a catalyst such as `MnO_(2)` or powdered glass is present to provide a surface from which `O_(2)` can escape. `2KCIO_(3) overset(Delta)rarr2KCI+3O_(2)` In the absence of a cataysist ,especially at a lower temperature `KCIO_(3)` tends to disproportionate to perchlorate and chloride: `4KCIO_(3)rarr3KCIO_(4)+KCI` When `Zn(CIO_(3))_(2)` is heated it decomposes to `O_(2)` and `CI_(2)`: `2Zn(CIO_(3))_(2)rarr2ZnO+2CI_(2)+5O_(2)` |
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