Question

The transitional metal which form green compound in +3 oxidation state and yellow orange compound in +6 oxidation state is.

• A. $Fe$
• B. $Ni$
• C. $Cr$
• D. $Co$

Answer 1

Answer: (C)

$Cr$

Answer 2

$(Cr^{+ 6}K_{2}Cr_{2}O_{7} - \text{yellow}Cr^{+ 3}Cr_{2}(SO_{4})_{3}$– green)