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Question

The equivalent mass of sodium thiosulphate (Na2S2O35H2O) in the reaction,
2Na2S2O3+I22NaI+Na2S4O6 is

A
248
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B
124
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C
596
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D
62
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Solution

The correct option is A 248

The equivalent weight is the gram molecular weight divided by the number of electrons lost or gained by each molecule; For sodium thiosulfate (Na2S2O35H2O), this is (248.17/1) g.

In case of Sodium Thiosulfate the reaction proceeds as under:

I2+2Na2S2O3Na2S4O6+2NaI

The conversion of 2Na2S2O3 to I2 2 electrons are transfered.

Hence for 1 Na2S2O3, 1 electron is transfered.

Thus Molecular weight divded by 1 is the equivalent weight & hence both have same value.

Hence option A is correct.


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