Which of the following transition metal ions/compounds has/have the oxidation state of +6? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

**(A)** $CrO_2Cl_2$: $x + 2(-2) + 2(-1) = 0 \Rightarrow x = +6$. <br>**(B)** $MnO_4^-$: $x + 4(-2) = -1 \Rightarrow x = +7$. <br>**(C)** $[Cr(OH)_4]^-$: $x + 4(-1) = -1 \Rightarrow x = +3$. <br>**(D)** $K_2FeO_4$: $2(+1) + x + 4(-2) = 0 \Rightarrow x = +6$. [2]