Mole ConceptHard
Question
A solution containing Cu2+ and C2 ions which is titrated with 20 ml of M/4 KMnO4 solution in acidic medium completely. The resulting solution is treated with excess of KI after neutralisation. The evolved I2 is then absorbs in 25 ml of N/10 hypo solution, the difference in milli moles of Cu2+ and C2 ions in solution is -
Options
A.
10
B.
30
C.
40
D.
50
Solution
KMnO4 only oxidises C2 ion not Cu2+
So meq. of C2O4
2– = meq. of KMnO4
meq of C2=
milli moles ofC2=12.5
meq. of Cu2+ = meq. of hypo {Cu2+ Cu+}
milli moles of Cu2+ = 2.5
difference of milli moles = 10
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