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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)+con. H_(2)SO_(4)rarrCrO_(2)Cl_(2)+K_(2)SO_(4)+H_(2)O`

B

`K_(2)Cr_(2)O_(7)+H_(2)O_(2)+con. H_(2)SO_(4)+rarrK_(2)SO_(4)+CrO_(5)+H_(2)O`

C

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

D

`K_(2)Cr_(2)O_(7)+2KOHrarr2K_(2)CrO_(4)+H_(2)O`

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