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The formula mass of Mohr's salt is 392. The iron present in it is oxidised by KMnO4 in acidic medium. The equivalent mass of Mohr's salt is
- a)392
- b)31.6
- c)278
- d)156
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The formula mass of Mohrs salt is 392. The iron present in it is oxidi...
Mohr's salt is (NH4)2SO4.FeSO4.6H2O.
The equation is 5Fe2+ + MnO-4 + 8H+
5Fe3+ + Mn2+ + 4H2O
Total change in oxidation number of iron = (+3) - (+2)
So, equivalent weight of Mohr's salt
=
=
= 392
The equation is 5Fe2+ + MnO-4 + 8H+
5Fe3+ + Mn2+ + 4H2OTotal change in oxidation number of iron = (+3) - (+2)
So, equivalent weight of Mohr's salt
=
=
= 392
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The formula mass of Mohrs salt is 392. The iron present in it is oxidi...
Formula mass of Mohr's salt
The formula mass of Mohr's salt is given as 392.
Oxidation of iron by KMnO4
When iron is oxidized by KMnO4 in acidic medium, the following reaction takes place:
5Fe2+ + MnO4- + 8H+ → 5Fe3+ + Mn2+ + 4H2O
Equivalent mass of Mohr's salt
The equivalent mass of a substance is defined as the mass of the substance that combines with or displaces one mole of hydrogen ions (H+) or any other ion or group of ions that can be exchanged in a reaction.
Since Mohr's salt is a ferrous salt, it can be oxidized to ferric salt by KMnO4 in acidic medium. As per the above equation, 5 moles of Fe2+ react with one mole of MnO4-. Therefore, the equivalent mass of Mohr's salt can be calculated as follows:
Equivalent mass = Formula mass / n
where n is the number of moles of electrons gained or lost by the substance in a redox reaction.
In the given reaction, Fe2+ is oxidized to Fe3+ by losing one electron. Therefore, n = 1.
Hence, equivalent mass of Mohr's salt = 392 / 1 = 392.
Therefore, the correct answer is option 'A'.
The formula mass of Mohr's salt is given as 392.
Oxidation of iron by KMnO4
When iron is oxidized by KMnO4 in acidic medium, the following reaction takes place:
5Fe2+ + MnO4- + 8H+ → 5Fe3+ + Mn2+ + 4H2O
Equivalent mass of Mohr's salt
The equivalent mass of a substance is defined as the mass of the substance that combines with or displaces one mole of hydrogen ions (H+) or any other ion or group of ions that can be exchanged in a reaction.
Since Mohr's salt is a ferrous salt, it can be oxidized to ferric salt by KMnO4 in acidic medium. As per the above equation, 5 moles of Fe2+ react with one mole of MnO4-. Therefore, the equivalent mass of Mohr's salt can be calculated as follows:
Equivalent mass = Formula mass / n
where n is the number of moles of electrons gained or lost by the substance in a redox reaction.
In the given reaction, Fe2+ is oxidized to Fe3+ by losing one electron. Therefore, n = 1.
Hence, equivalent mass of Mohr's salt = 392 / 1 = 392.
Therefore, the correct answer is option 'A'.
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The formula mass of Mohrs salt is 392. The iron present in it is oxidised by KMnO4in acidic medium. The equivalent mass of Mohrs salt isa)392b)31.6c)278d)156Correct answer is option 'A'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about The formula mass of Mohrs salt is 392. The iron present in it is oxidised by KMnO4in acidic medium. The equivalent mass of Mohrs salt isa)392b)31.6c)278d)156Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The formula mass of Mohrs salt is 392. The iron present in it is oxidised by KMnO4in acidic medium. The equivalent mass of Mohrs salt isa)392b)31.6c)278d)156Correct answer is option 'A'. Can you explain this answer?.
The formula mass of Mohrs salt is 392. The iron present in it is oxidised by KMnO4in acidic medium. The equivalent mass of Mohrs salt isa)392b)31.6c)278d)156Correct answer is option 'A'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about The formula mass of Mohrs salt is 392. The iron present in it is oxidised by KMnO4in acidic medium. The equivalent mass of Mohrs salt isa)392b)31.6c)278d)156Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The formula mass of Mohrs salt is 392. The iron present in it is oxidised by KMnO4in acidic medium. The equivalent mass of Mohrs salt isa)392b)31.6c)278d)156Correct answer is option 'A'. Can you explain this answer?.
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