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The heating of (NH(4))2Cr(2)O(7) produce...

The heating of `(NH_(4))2Cr_(2)O_(7)` produces another chromium compound along with `N_(2)` gas. The change of oxidation state of Cr in the reaction is

A

`+6 to +2`

B

`+7 to +4`

C

`+8 to +4`

D

`+6 to +3`

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