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Potassium manganate (K2MnO4) is formed when
- a)chlorine is passed into aqueous KMnO4 solution
- b)manganese dioxide is fused with potassium hydroxide in air
- c)formaldehyde reacts with potassium permanganate in presence of a strong alkali
- d)potassium permanganate reacts with conc. sulphuric acid
Correct answer is option 'B,C'. Can you explain this answer?
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Formation of Potassium Manganate (K2MnO4)
Potassium manganate (K2MnO4) is a purple-colored compound that is formed by the reaction of manganese dioxide with potassium hydroxide in air. It can also be formed by the reaction of formaldehyde with potassium permanganate in the presence of a strong alkali.
Reaction 1: Manganese dioxide is fused with potassium hydroxide in air
Manganese dioxide (MnO2) and potassium hydroxide (KOH) are fused together in air to produce potassium manganate (K2MnO4).
2MnO2 + 4KOH + O2 → 2K2MnO4 + 2H2O
This reaction takes place due to the oxidation of MnO2 to MnO4^2- by the oxygen present in air.
Reaction 2: Formaldehyde reacts with potassium permanganate in the presence of a strong alkali
In this reaction, formaldehyde (HCHO) reacts with potassium permanganate (KMnO4) in the presence of a strong alkali like sodium hydroxide (NaOH) or potassium hydroxide (KOH) to produce potassium manganate (K2MnO4).
HCHO + KMnO4 + 2KOH → K2MnO4 + H2O + KO2
This reaction takes place due to the oxidation of formaldehyde to formic acid (HCOOH) and then to carbon dioxide (CO2) by KMnO4.
Conclusion
Potassium manganate (K2MnO4) is formed by the reaction of manganese dioxide with potassium hydroxide in air and by the reaction of formaldehyde with potassium permanganate in the presence of a strong alkali. These reactions take place due to the oxidation of the reactants by the oxidizing agents present in the reactions.
Potassium manganate (K2MnO4) is a purple-colored compound that is formed by the reaction of manganese dioxide with potassium hydroxide in air. It can also be formed by the reaction of formaldehyde with potassium permanganate in the presence of a strong alkali.
Reaction 1: Manganese dioxide is fused with potassium hydroxide in air
Manganese dioxide (MnO2) and potassium hydroxide (KOH) are fused together in air to produce potassium manganate (K2MnO4).
2MnO2 + 4KOH + O2 → 2K2MnO4 + 2H2O
This reaction takes place due to the oxidation of MnO2 to MnO4^2- by the oxygen present in air.
Reaction 2: Formaldehyde reacts with potassium permanganate in the presence of a strong alkali
In this reaction, formaldehyde (HCHO) reacts with potassium permanganate (KMnO4) in the presence of a strong alkali like sodium hydroxide (NaOH) or potassium hydroxide (KOH) to produce potassium manganate (K2MnO4).
HCHO + KMnO4 + 2KOH → K2MnO4 + H2O + KO2
This reaction takes place due to the oxidation of formaldehyde to formic acid (HCOOH) and then to carbon dioxide (CO2) by KMnO4.
Conclusion
Potassium manganate (K2MnO4) is formed by the reaction of manganese dioxide with potassium hydroxide in air and by the reaction of formaldehyde with potassium permanganate in the presence of a strong alkali. These reactions take place due to the oxidation of the reactants by the oxidizing agents present in the reactions.
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Potassium manganate (K2MnO4) is formed whena)chlorine is passed into aqueous KMnO4 solutionb)manganese dioxide is fused with potassium hydroxide in airc)formaldehyde reacts with potassium permanganate in presence of a strong alkalid)potassium permanganate reacts with conc. sulphuric acidCorrect answer is option 'B,C'. Can you explain this answer?
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Potassium manganate (K2MnO4) is formed whena)chlorine is passed into aqueous KMnO4 solutionb)manganese dioxide is fused with potassium hydroxide in airc)formaldehyde reacts with potassium permanganate in presence of a strong alkalid)potassium permanganate reacts with conc. sulphuric acidCorrect answer is option 'B,C'. 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 Potassium manganate (K2MnO4) is formed whena)chlorine is passed into aqueous KMnO4 solutionb)manganese dioxide is fused with potassium hydroxide in airc)formaldehyde reacts with potassium permanganate in presence of a strong alkalid)potassium permanganate reacts with conc. sulphuric acidCorrect answer is option 'B,C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Potassium manganate (K2MnO4) is formed whena)chlorine is passed into aqueous KMnO4 solutionb)manganese dioxide is fused with potassium hydroxide in airc)formaldehyde reacts with potassium permanganate in presence of a strong alkalid)potassium permanganate reacts with conc. sulphuric acidCorrect answer is option 'B,C'. Can you explain this answer?.
Potassium manganate (K2MnO4) is formed whena)chlorine is passed into aqueous KMnO4 solutionb)manganese dioxide is fused with potassium hydroxide in airc)formaldehyde reacts with potassium permanganate in presence of a strong alkalid)potassium permanganate reacts with conc. sulphuric acidCorrect answer is option 'B,C'. 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 Potassium manganate (K2MnO4) is formed whena)chlorine is passed into aqueous KMnO4 solutionb)manganese dioxide is fused with potassium hydroxide in airc)formaldehyde reacts with potassium permanganate in presence of a strong alkalid)potassium permanganate reacts with conc. sulphuric acidCorrect answer is option 'B,C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Potassium manganate (K2MnO4) is formed whena)chlorine is passed into aqueous KMnO4 solutionb)manganese dioxide is fused with potassium hydroxide in airc)formaldehyde reacts with potassium permanganate in presence of a strong alkalid)potassium permanganate reacts with conc. sulphuric acidCorrect answer is option 'B,C'. Can you explain this answer?.
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