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Which is not true statement about KMnO4?
- a)Its solution is unstable in acidic medium
- b)Its small quantity added to conc. H2 SO4, a green coloured solution containing MnO-3 ion is formed
- c)MnO4- changes to Mn2+ in basic solution
- d)It is self- indicator in Fe2+ or C2O42-titration.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Which is not true statement about KMnO4?a)Its solution is unstable in ...
In basic medium KMnO4 does not changes to Mn+2, it changes to MnO2
Most Upvoted Answer
Which is not true statement about KMnO4?a)Its solution is unstable in ...
Explanation:
The given statement is "MnO4- changes to Mn2+ in basic solution" which is not true. Let's break down the statement and analyze why it is incorrect.
1. KMnO4 Solution Stability:
- KMnO4 is an oxidizing agent and its solution is unstable in acidic medium. In an acidic solution, KMnO4 undergoes reduction to form Mn2+ ions. This is because MnO4- is a strong oxidizing agent and it can easily oxidize other species in the solution. In the process, it gets reduced to Mn2+ ions.
- Therefore, option (a) is a true statement.
2. Formation of Green Colored Solution:
- When a small quantity of KMnO4 is added to concentrated H2SO4, a green colored solution containing MnO-3 ions is formed. This is due to the reaction between KMnO4 and H2SO4, which results in the formation of MnO-3 ions.
- So, option (b) is a true statement.
3. MnO4- in Basic Solution:
- MnO4- ions are stable in basic solution. In a basic medium, MnO4- ions do not undergo any further reduction to Mn2+ ions. They remain in the form of MnO4- in basic solution.
- Therefore, option (c) is a false statement.
4. KMnO4 as a Self-Indicator:
- KMnO4 can act as a self-indicator in redox titrations involving Fe2+ or C2O42- ions. In the presence of Fe2+ or C2O42- ions, KMnO4 undergoes reduction, resulting in the decolorization of the KMnO4 solution. The endpoint of the titration is indicated by the complete decolorization of the KMnO4 solution.
- Hence, option (d) is a true statement.
Conclusion:
- The incorrect statement among the given options is option (c) which states that MnO4- changes to Mn2+ in basic solution. In reality, MnO4- ions are stable in basic solutions and do not undergo any further reduction.
The given statement is "MnO4- changes to Mn2+ in basic solution" which is not true. Let's break down the statement and analyze why it is incorrect.
1. KMnO4 Solution Stability:
- KMnO4 is an oxidizing agent and its solution is unstable in acidic medium. In an acidic solution, KMnO4 undergoes reduction to form Mn2+ ions. This is because MnO4- is a strong oxidizing agent and it can easily oxidize other species in the solution. In the process, it gets reduced to Mn2+ ions.
- Therefore, option (a) is a true statement.
2. Formation of Green Colored Solution:
- When a small quantity of KMnO4 is added to concentrated H2SO4, a green colored solution containing MnO-3 ions is formed. This is due to the reaction between KMnO4 and H2SO4, which results in the formation of MnO-3 ions.
- So, option (b) is a true statement.
3. MnO4- in Basic Solution:
- MnO4- ions are stable in basic solution. In a basic medium, MnO4- ions do not undergo any further reduction to Mn2+ ions. They remain in the form of MnO4- in basic solution.
- Therefore, option (c) is a false statement.
4. KMnO4 as a Self-Indicator:
- KMnO4 can act as a self-indicator in redox titrations involving Fe2+ or C2O42- ions. In the presence of Fe2+ or C2O42- ions, KMnO4 undergoes reduction, resulting in the decolorization of the KMnO4 solution. The endpoint of the titration is indicated by the complete decolorization of the KMnO4 solution.
- Hence, option (d) is a true statement.
Conclusion:
- The incorrect statement among the given options is option (c) which states that MnO4- changes to Mn2+ in basic solution. In reality, MnO4- ions are stable in basic solutions and do not undergo any further reduction.
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Which is not true statement about KMnO4?a)Its solution is unstable in acidic mediumb)Its small quantity added to conc.H2SO4, a green coloured solution containing MnO-3ion is formedc)MnO4-changes to Mn2+in basic solutiond)It is self- indicator in Fe2+orC2O42-titration.Correct answer is option 'C'. Can you explain this answer? for UGC NET 2025 is part of UGC NET preparation. The Question and answers have been prepared according to the UGC NET exam syllabus. Information about Which is not true statement about KMnO4?a)Its solution is unstable in acidic mediumb)Its small quantity added to conc.H2SO4, a green coloured solution containing MnO-3ion is formedc)MnO4-changes to Mn2+in basic solutiond)It is self- indicator in Fe2+orC2O42-titration.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UGC NET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which is not true statement about KMnO4?a)Its solution is unstable in acidic mediumb)Its small quantity added to conc.H2SO4, a green coloured solution containing MnO-3ion is formedc)MnO4-changes to Mn2+in basic solutiond)It is self- indicator in Fe2+orC2O42-titration.Correct answer is option 'C'. Can you explain this answer?.
Which is not true statement about KMnO4?a)Its solution is unstable in acidic mediumb)Its small quantity added to conc.H2SO4, a green coloured solution containing MnO-3ion is formedc)MnO4-changes to Mn2+in basic solutiond)It is self- indicator in Fe2+orC2O42-titration.Correct answer is option 'C'. Can you explain this answer? for UGC NET 2025 is part of UGC NET preparation. The Question and answers have been prepared according to the UGC NET exam syllabus. Information about Which is not true statement about KMnO4?a)Its solution is unstable in acidic mediumb)Its small quantity added to conc.H2SO4, a green coloured solution containing MnO-3ion is formedc)MnO4-changes to Mn2+in basic solutiond)It is self- indicator in Fe2+orC2O42-titration.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UGC NET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which is not true statement about KMnO4?a)Its solution is unstable in acidic mediumb)Its small quantity added to conc.H2SO4, a green coloured solution containing MnO-3ion is formedc)MnO4-changes to Mn2+in basic solutiond)It is self- indicator in Fe2+orC2O42-titration.Correct answer is option 'C'. Can you explain this answer?.
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