Which polyatomic anion is unstable in solution ?
Correct answer: D. MnO42-
- A. BO2-
- B. SnO32
- C. S2O34-
- D. MnO42-
Explanation
It is a fact and has to be learntThe correct answer is D) MnO42-.MnO42- is unstable in solution because it can disproportionate to form MnO4- and MnO2. This occurs in basic solution according to the following reaction:3MnO42- + 2H2O → 2MnO4- + MnO2 + 4OH-The other options (BO₂, SnO32, S2034-) are stable polyatomic anions in solution.
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About Redox Reactions
Redox reactions involve oxidation and reduction occurring together, with electrons transferred between species or oxidation numbers changing. The topic covers assigning oxidation states, identifying oxidizing and reducing agents, balancing redox equations by oxidation number or half-reaction methods, and connecting chemical changes with galvanic and electrolytic cells.
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