MCQ
The oxidation state of $Fe$ in the complex $[Fe{(CO)_5}]$ is
- A$-1$
- B$2$
- C$4$
- ✓$0$
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$(A)$ The electronic configuration of $Cr$ is $[ Ar ] 3 d ^{5}$ $4 s^{1}$.
$(B)$ The magnetic quantum number may have a negative value.
$(C)$ In the ground state of an atom, the orbitals are filled in order of their increasing energies.
$(D)$ The total number of nodes are given by $n-2$.
Choose the most appropriate answer from the options given below ....