Multiple choice

When an equimolar mixture of Cu2S and CuS is titrated with Ba(MnO4) in acidic medium, the final products contain Cu2+, SO2 and Mn2+. If the mol. wt. of Cu2S, CuS and Ba(MnO4)2 are M1, M2, M3 respectively, then,

  1. eq. wt. of Cu2S is M1/8

  2. eq. wt. of CuS is M2/4

  3. eq. wt. of Ba(MnO4)2 is M3/5

  4. Cu2S and CuS, both have same equivalent in mixture

  5. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The required reaction is, MnO4– +  8H+ +5e  →  Mn2+ + 4H2O Cu+ – e → Cu2+ S2– – 6e → S4+ Therefore, eq. wt. of Cu2S = (M1 / ((1*2) + 6)) = M1 / 8 Hence, this is a correct option.  

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