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In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is
  1. (Molecular weight)/2
  2. (Molecular Weight)/6
  3. (Molecular weight)/3
  4. Same as molecular weight


Solution

The correct option is B (Molecular Weight)/6
K2Cr2O7 acts as an oxidising agent in the presence of dil.H2SO4
Cr2O27+14H++6e2Cr3++7H2O
Eq.W=Molecular WeightNumber of e gain=M6

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