Q.

80 millimoles of MnO4- completely oxidises 30 millimoles of S2O3-2 in basic medium. The concentration of 300 ml of SO4-2 formed in the reaction is

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answer is 3.

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Detailed Solution

8MnO4-+3S2O3-2+H2O→8MnO2+6SO4-2+2OH-Number of milli moles of MnO4-  = 80 Number of milli moles of S2O3-2 = 30Number of milli moles of SO4-2 = 6060 = 300 ml x MM = 0.2M
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