In the following reaction, Na2S2O3 is converted to Na2S4O6. 2Na2S2O3+I2→Na2S4O6+2NaI The equivalent weight of Na2S2O3 for this reaction is:
(The molecular weight of Na2S2O3=M)
A
M
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B
M4
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C
M2
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D
M3
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Solution
The correct option is AM The molecular weight of Na2S2O3=MNa2S2O3+12I2→12Na2S4O6+NaIOxidation state ofSinNa2S2O3=+2Oxidation state ofSinNa2S4O6=+2.5∴ΔO.S.=2.5−2=0.5∴nf=2×0.5=1Where, O.S. is the oxidation stateEquivalent weight=Molecular weightnf=M1=M