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In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is

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In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is

(a)  Molar mass/2

(b)  Molar mass/6

(c)  Molar mass/3

(d)  same as molar mass

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Correct option (b)  Molar mass/6

  • During the reaction, Cr2 O72-  changes to Cr3+. Hence the change in oxidation number of Cr is 6.
  • Equivalent weigh = Molar mass/6
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