Find the equivalent weight of Cr2O2−7 in the given reaction, if the molar mass of Cr2O2−7 is 'M' ? Cr2O2−7H+→Cr3+
A
M3
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B
M
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C
M6
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D
2M
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Solution
The correct option is CM6 In acidic medium, the balanced reaction will be: 6e−++6Cr2O2−7+14H+→2+3Cr3++7H2O
n -factor nfofK2Cr2O7=|3−6|×2=6 Equivalent weight ofK2Cr2O7=Mol.wtofK2Cr2O76=M6