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Question

# In the reaction of sodium thiosulphate with I2 in aqueous medium the equivalent weight of sodium thiosulphate is equal to:

A
Molar mass of sodium thiosulphate
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B
The average molar mass of Na2S2O3 and I2
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C
Half the molar mass of sodium thiosulphate
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D
Twice of molar mass of sodium thiosulphate
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Solution

## The correct option is B Molar mass of sodium thiosulphateI2+2Na2S2O3→2NaI+Na2S4O6Equivalent weight is the molecular weight divided by number of electrons lost or gained by each molecule.Half reactions occur as:I2+2e−→2I−2S2O32−→S4O62−+2e−For 2 electrons lost by 2 molecules of S2O32−(Sodium thiosulphate). So one molecule will lost 1 electron so equivalent weight is equal to molecular weight divided by 1.Equivalent weight = Molecular weight

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