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Q.

A mixture containing 0.05 mol of K2Cr2O7 and of KMnO4 was treated with excess of KI in acidic medium. The liberated iodine required 2.0L of Na2S2O3 solution for titration. Concentration of Na2S2O3 solution was

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a

0.125mol L−1

b

0.20mol L−1

c

0.30mol L−1

d

0.25mol L−1

answer is B.

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Detailed Solution

 Eqts K2Cr2O7+ Eqts KMnO4= Eqts of Na2S2O3
(0.05×6)+(0.02×5)=2×1×M M=0.20mol/ litre 

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