Question

The complex ion which has no ‘d’ electrons in the central metal atom is ______.

विकल्प

• \[\ce{[MnO^{-}_4]}\]

• [Co(NH₃)₆]³⁺

• [Fe(CN)₆]³⁻

• [Cr(H₂O)₆]³⁺

Answer 1

The complex ion which has no ‘d’ electrons in the central metal atom is \[\ce{\mathbf{\underline{[MnO^{-}_4]}}}\].

Explanation:

The complex ion \[\ce{[MnO^{-}_4]}\] has manganese in the +7 oxidation state, where it has no d-electrons. This occurs because manganese in this state has an electron configuration of [Ar]3d⁰4s⁰, meaning all the d-electrons are absent, making it d-electron deficient.