List of top Chemistry Questions on Coordination Compounds asked in NEST

The increasing order of acidic strength for the aqua complexes $[\text{V}(\text{H}_2\text{O})_6]^{2+}$, $[\text{Fe}(\text{H}_2\text{O})_6]^{2+}$, $[\text{Fe}(\text{H}_2\text{O})_6]^{3+}$, and $[\text{Co}(\text{H}_2\text{O})_6]^{3+}$ is:

Consider the following table of three lanthanoid ions X, Y, and Z and their properties.

Atomic numbers of Ce, Eu, and Lu are 58, 63, and 71, respectively. Given these atomic numbers, the lanthanoid ions X, Y, and Z, respectively, are:

Consider the following complex ions:
$[\text{Ni(CN)}_4]^{2-}$, $[\text{Fe(CN)}_6]^{3-}$, $[\text{Cu(H}_2\text{O)}_6]^{2+}$, and $[\text{Co(CN)}_6]^{3-}$.
The complex ions that are expected to show diamagnetic behavior at room temperature are:

Negatively charged monodentate strong field ligand \(X^-\) and weak field ligand \(Y^-\) form the complexes \[ [MnX_6]^{4-} \quad \text{and} \quad [MnY_6]^{4-} \] respectively. Under certain reaction conditions, let the crystal field splitting energies for \[ [MnX_6]^{4-} \quad \text{and} \quad [MnY_6]^{4-} \] be \(\Delta_{o1}\) and \(\Delta_{o2}\), respectively. Which of the following statements is/are correct?