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Which of the following is/are redox reac...

Which of the following is/are redox reaction.

A

`KCl + K_(2) Cr_(2)O_(7) to con.H_(2)SO_(4) to CrO_(2)Cl_(2) +K_(2)SO_(4) +H_(2)O`

B

`K_(2) cr_(2)O_(7) + H_(2) O_(2) + dil.H_(2)SO_(4)+Cr_(2)(SO_(4))_(3) + 7H_(2)O + 3O_(2)`

C

`K_(2) Cr_(2)O_(7) + H_(2)O_(2)+ dil.H_(2)SO_(4) to K_(2)SO_(4)+Cr(SO_(4))_(3) + 7H_(2)O +3O_(2)`

D

`K_(2)Cr_(2)O_(7) +2KOH to 2K_(2) CrO_(4) +H_(2)O`

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A, B, C
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