Which substance serves as reducing agent...

Which substance serves as reducing agent in the following reaction?
`14H^(+)+Cr_(2)O_(7)^(2-)+3Nito2Cr^(3+)+7H_(2)O+3Ni^(2+)`

`H_(2)O`

`Ni`

`H^(+)`

`Cr_(2)O_(7)^(2-)`

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