Question

In which of the following complexes oxidation state of metal is zero.

• A. $\left\lbrack Pt\left( NH_{3} \right)_{2}Cl_{2} \right\rbrack$
• B. $\left\lbrack Cr(CO)_{6} \right\rbrack$
• C. $\left\lbrack Cr\left( NH_{3} \right)_{3}Cl_{3} \right\rbrack$
• D. $\left\lbrack Cr(en)_{2}Cl_{2} \right\rbrack$

Answer 1

Answer: (B)

$\left\lbrack Cr(CO)_{6} \right\rbrack$

Answer 2

The oxidation state of metal in metal carbonyl is zero.