Question

In which of the following compounds, the transitions metal is in oxidations state of zero?

• A. $\lbrack Fe(H_{2}O)_{3}(OH)_{3}\rbrack$
• B. $\lbrack Ni(CO)_{4}\rbrack$
• C. $\lbrack Fe(H_{2}O)_{6}\rbrack SO_{4}$
• D. $\lbrack Co(NH_{3})_{6}\rbrack Cl_{3}$

Answer 1

Answer: (B)

$\lbrack Ni(CO)_{4}\rbrack$

Answer 2

In metal carbonyls, metal is in zero oxidations state.