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Equivalent mass of K2Cr2O7 when it acts as an oxidizing agent in acidic medium?
- a)49
- b)96
- c)194
- d)294
Correct answer is option 'A'. Can you explain this answer?
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Equivalent mass of K2Cr2O7when it acts as an oxidizing agent in acidic...
The equivalent mass of K2Cr2O7 when it acts as an oxidizing agent in acidic medium is 49.
Explanation:
Equivalent mass is the molecular weight of a substance divided by its valency.
K2Cr2O7, in acidic medium, acts as an oxidizing agent and gets reduced to Cr3+ ion.
The balanced chemical equation for the reaction is:
K2Cr2O7 + 8H+ + 6e- → 2Cr3+ + 2K+ + 7H2O
From the equation, it can be seen that 1 mole of K2Cr2O7 accepts 6 moles of electrons.
The molecular weight of K2Cr2O7 is 294 g/mol and its valency is 6.
Therefore, the equivalent mass of K2Cr2O7 can be calculated as:
Equivalent mass = Molecular weight/Valency
Equivalent mass = 294/6
Equivalent mass = 49
Hence, the equivalent mass of K2Cr2O7 when it acts as an oxidizing agent in acidic medium is 49.
Explanation:
Equivalent mass is the molecular weight of a substance divided by its valency.
K2Cr2O7, in acidic medium, acts as an oxidizing agent and gets reduced to Cr3+ ion.
The balanced chemical equation for the reaction is:
K2Cr2O7 + 8H+ + 6e- → 2Cr3+ + 2K+ + 7H2O
From the equation, it can be seen that 1 mole of K2Cr2O7 accepts 6 moles of electrons.
The molecular weight of K2Cr2O7 is 294 g/mol and its valency is 6.
Therefore, the equivalent mass of K2Cr2O7 can be calculated as:
Equivalent mass = Molecular weight/Valency
Equivalent mass = 294/6
Equivalent mass = 49
Hence, the equivalent mass of K2Cr2O7 when it acts as an oxidizing agent in acidic medium is 49.
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