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If the formula mass of C r (2) O (7) ^( ...

If the formula mass of `C r _(2) O _(7) ^( 2-)` ion is M, then in the reaction `Cr _(2) O _(7) ^( 2-) + 14 H ^(+) + 6 e ^(-) to 2 Cr ^(3+) + 7 H _(2) O,`
The equivalent mass of `Cr _(2) O _(7) ^(2-) ` is

A

`M`

B

`(M)/(2)`

C

`(M)/(6)`

D

`(M)/(14)`

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