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K(2)Cr(2)O(7)+C(2)O(4)^(2-)+H(2)SO(4)rar...

`K_(2)Cr_(2)O_(7)+C_(2)O_(4)^(2-)+H_(2)SO_(4)rarr K_(2)SO_(4)+CO_(2)+Cr_(2)(SO_(4))_(3)+H_(2)O`
In above reaction, identify the elements which do not undergo change in their oxidation state `:`

A

`C`

B

`S & C`

C

`K,O,S & H`

D

`C & O`

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