JEE Exam > JEE Questions > Pick out the incorrect statement :a)MnO2disso...
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Pick out the incorrect statement :
- a)MnO2 dissolves in conc. HCl, but does not form Mn4+ ions
- b)MnO2 oxidizes hot concentrated H2SO4 liberating oxygen
- c)K2MnO4 is formed when MnO2 in fused KOH is oxidised by air, KNO3, PbO2 or NaBiO3
- d)Decomposition of acidic KMnO4 is not catalysed by sunlight.
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but do...
MnO2 + HCl → MnCl2+H2O + Cl2
MnO2 + H2SO4 → MnSO4 + H2O + O2
MnO2 + H2SO4 → MnSO4 + H2O + O2
Most Upvoted Answer
Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but do...
Incorrect statement: Decomposition of acidic KMnO4 is not catalysed by sunlight.
Explanation:
Decomposition of KMnO4:
When potassium permanganate (KMnO4) is dissolved in water, it ionizes to form the MnO4- ion. In acidic conditions, the MnO4- ion undergoes disproportionation and gets reduced to Mn2+ and oxidized to MnO2. The overall reaction can be represented as follows:
2MnO4- + 16H+ → 2Mn2+ + 8H2O + 5O2
This reaction is exothermic and can be accelerated by the presence of a catalyst.
Catalysis by Sunlight:
Sunlight contains a wide spectrum of electromagnetic radiation, including ultraviolet (UV) light. UV light can provide the necessary energy to initiate chemical reactions. In the case of KMnO4, sunlight can act as a catalyst in the decomposition reaction.
Importance of Catalyst:
A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It provides an alternative reaction pathway with lower activation energy, allowing the reaction to occur more readily. Catalysts can be in the form of solids, liquids, or gases.
Decomposition of KMnO4 by Sunlight:
Sunlight, particularly UV light, can initiate the decomposition of acidic KMnO4. The energy provided by sunlight breaks the bonds in the KMnO4 molecule, leading to the formation of MnO2 and the liberation of oxygen gas (O2). This process is known as photodecomposition.
Conclusion:
The incorrect statement is option 'D' which states that the decomposition of acidic KMnO4 is not catalyzed by sunlight. In reality, sunlight, especially UV light, acts as a catalyst in the decomposition of KMnO4, accelerating the reaction and facilitating the formation of MnO2 and O2 gas.
Explanation:
Decomposition of KMnO4:
When potassium permanganate (KMnO4) is dissolved in water, it ionizes to form the MnO4- ion. In acidic conditions, the MnO4- ion undergoes disproportionation and gets reduced to Mn2+ and oxidized to MnO2. The overall reaction can be represented as follows:
2MnO4- + 16H+ → 2Mn2+ + 8H2O + 5O2
This reaction is exothermic and can be accelerated by the presence of a catalyst.
Catalysis by Sunlight:
Sunlight contains a wide spectrum of electromagnetic radiation, including ultraviolet (UV) light. UV light can provide the necessary energy to initiate chemical reactions. In the case of KMnO4, sunlight can act as a catalyst in the decomposition reaction.
Importance of Catalyst:
A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It provides an alternative reaction pathway with lower activation energy, allowing the reaction to occur more readily. Catalysts can be in the form of solids, liquids, or gases.
Decomposition of KMnO4 by Sunlight:
Sunlight, particularly UV light, can initiate the decomposition of acidic KMnO4. The energy provided by sunlight breaks the bonds in the KMnO4 molecule, leading to the formation of MnO2 and the liberation of oxygen gas (O2). This process is known as photodecomposition.
Conclusion:
The incorrect statement is option 'D' which states that the decomposition of acidic KMnO4 is not catalyzed by sunlight. In reality, sunlight, especially UV light, acts as a catalyst in the decomposition of KMnO4, accelerating the reaction and facilitating the formation of MnO2 and O2 gas.
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Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer?
Question Description
Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer?.
Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer?.
Solutions for Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE.
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Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer?, a detailed solution for Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Pick out the incorrect statement :a)MnO2dissolves in conc. HCl, but does not form Mn4+ionsb)MnO2oxidizes hot concentrated H2SO4liberating oxygenc)K2MnO4is formed when MnO2in fused KOH is oxidised by air, KNO3, PbO2or NaBiO3d)Decomposition of acidic KMnO4is not catalysed by sunlight.Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice JEE tests.
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