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How many moles of electrons are involved...

How many moles of electrons are involved in the conversion of 1 mol `Cr_(2)O_(7)^(2-)` into `Cr^(3+)` ion?
`Cr_(2)O_(7)^(2-)+14H^(+)+6e^(-) to 2Cr^(3+)+7H_(2)O`

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The correct Answer is:
6
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