Which of the following is not a redox reaction

Options

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`

Answer

D

Explanation

`K_(2)Cr_(2)O_^(7)+KOHrarrK_(2)CrO_(4)+H_(2)O`
Oxidation state of Cr will remain same in reactant as well as product.