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Name the gas that can readily decolourise acidified KMnO4 solution :
- a)SO2
- b)NO2
- c)P2O5
- d)CO2
Correct answer is option 'A'. Can you explain this answer?
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Name the gas that can readily decolourise acidified KMnO4 solution :a)...
Decolourisation of Acidified KMnO4 Solution
The gas that can readily decolourise acidified KMnO4 solution is sulfur dioxide (SO2). This reaction is used as a qualitative test for the presence of SO2 gas.
Reaction:
SO2 + H2SO4 + 2KMnO4 → K2SO4 + 2MnSO4 + 2H2O + 2KOH + 3O2
Explanation:
KMnO4 is a strong oxidising agent, which can oxidise SO2 gas to sulfuric acid. The acidified KMnO4 solution, when exposed to SO2 gas, reacts with it and gets reduced to manganese(II) ions, which leads to the decolourisation of the solution.
Hence, the acidified KMnO4 solution acts as an oxidising agent, while SO2 acts as a reducing agent. The reaction results in the formation of sulfuric acid, water, potassium sulfate, potassium hydroxide and oxygen.
Usage:
This reaction is used as a qualitative test for the presence of SO2 gas in the laboratory. When SO2 gas is passed through acidified KMnO4 solution, it turns the purple solution colourless.
Conclusion:
In conclusion, the gas that can readily decolourise acidified KMnO4 solution is SO2. This reaction is used as a qualitative test for the presence of SO2 gas in the laboratory.
The gas that can readily decolourise acidified KMnO4 solution is sulfur dioxide (SO2). This reaction is used as a qualitative test for the presence of SO2 gas.
Reaction:
SO2 + H2SO4 + 2KMnO4 → K2SO4 + 2MnSO4 + 2H2O + 2KOH + 3O2
Explanation:
KMnO4 is a strong oxidising agent, which can oxidise SO2 gas to sulfuric acid. The acidified KMnO4 solution, when exposed to SO2 gas, reacts with it and gets reduced to manganese(II) ions, which leads to the decolourisation of the solution.
Hence, the acidified KMnO4 solution acts as an oxidising agent, while SO2 acts as a reducing agent. The reaction results in the formation of sulfuric acid, water, potassium sulfate, potassium hydroxide and oxygen.
Usage:
This reaction is used as a qualitative test for the presence of SO2 gas in the laboratory. When SO2 gas is passed through acidified KMnO4 solution, it turns the purple solution colourless.
Conclusion:
In conclusion, the gas that can readily decolourise acidified KMnO4 solution is SO2. This reaction is used as a qualitative test for the presence of SO2 gas in the laboratory.
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Community Answer
Name the gas that can readily decolourise acidified KMnO4 solution :a)...
Acidified KMnO4 can be decolorized by SO2 .Sulphur dioxide is a reducing agent. Potassium permanganate is an oxidizing agent. When sulphur dioxide reacts with potassium permanganate the solution decolourizes.
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Name the gas that can readily decolourise acidified KMnO4 solution :a)SO2b)NO2c)P2O5d)CO2Correct answer is option 'A'. Can you explain this answer?
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