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The formula mass of Mohr's salt is 392. The iron present in it is oxidised by KMnO4 in acid 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?
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Most Upvoted Answer
The formula mass of Mohr's salt is 392. The iron present in it is oxi...
Mohr's salt is FeSO4.(NH4)2SO4.6H2O.
Fe2+ present in it is oxidized to Fe3+.
So, we have, Fe2+ → Fe3+ +e
= 392
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The formula mass of Mohr's salt is 392. The iron present in it is oxi...
Formula Mass of Mohr's Salt: 392
Mohr's salt, also known as ferrous ammonium sulfate, has a formula mass of 392. This means that 1 mole of Mohr's salt weighs 392 grams.
Equivalent Mass of Mohr's Salt
The equivalent mass of a substance is the mass which combines with or displaces 1.008 grams of hydrogen or 8.0 grams of oxygen. In the case of Mohr's salt, the equivalent mass is equal to its formula mass, which is 392.
Iron Oxidation by KMnO4 in Acid Medium
When iron in Mohr's salt is oxidized by KMnO4 in an acid medium, the following reaction occurs:
5Fe^2+ + MnO4^- + 8H^+ → 5Fe^3+ + Mn^2+ + 4H2O
Calculation of Equivalent Mass
In this reaction, 1 mole of iron (Fe) reacts with 1 mole of KMnO4. Since the formula mass of Fe is 56, and the molar ratio of Fe to KMnO4 is 1:1, the equivalent mass of Fe in this reaction is 56. Therefore, the equivalent mass of Mohr's salt, which contains iron, is equal to the formula mass of Mohr's salt, which is 392.
Therefore, the correct answer is option 'A' (392).
Mohr's salt, also known as ferrous ammonium sulfate, has a formula mass of 392. This means that 1 mole of Mohr's salt weighs 392 grams.
Equivalent Mass of Mohr's Salt
The equivalent mass of a substance is the mass which combines with or displaces 1.008 grams of hydrogen or 8.0 grams of oxygen. In the case of Mohr's salt, the equivalent mass is equal to its formula mass, which is 392.
Iron Oxidation by KMnO4 in Acid Medium
When iron in Mohr's salt is oxidized by KMnO4 in an acid medium, the following reaction occurs:
5Fe^2+ + MnO4^- + 8H^+ → 5Fe^3+ + Mn^2+ + 4H2O
Calculation of Equivalent Mass
In this reaction, 1 mole of iron (Fe) reacts with 1 mole of KMnO4. Since the formula mass of Fe is 56, and the molar ratio of Fe to KMnO4 is 1:1, the equivalent mass of Fe in this reaction is 56. Therefore, the equivalent mass of Mohr's salt, which contains iron, is equal to the formula mass of Mohr's salt, which is 392.
Therefore, the correct answer is option 'A' (392).
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The formula mass of Mohr's salt is 392. The iron present in it is oxidised by KMnO4 in acid medium. The equivalent mass of Mohr's salt isa)392b)31.6c)278d)156Correct answer is option 'A'. Can you explain this answer?
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