Magnetism Questions

Given below are two statements:Statement I: Ferromagnetism is considered as an extreme form of paramagnetism.Statement II: The number of unpaired electrons in a ${\text{Cr}}^{2+}$ ion ($Z=24$) is the same as that of a ${\text{Nd}}^{3+}$ ion ($Z=60$).In the light of the above statements, choose the correct answer from the options given below:

The $d$ -electron configurations of ${\text{Cr}}^{2+},{\text{Mn}}^{2+},{\text{Fe}}^{2+}$ and ${\text{Co}}^{2+}$ are $d^4,d^5,d^6$ and $d^7$ respectively. Which one of the following will exhibit minimum paramagnetic behaviour?

Of the following complex ions, which is diamagnetic in nature?

The diamagnetic species is:

Assertion : Potassium ferrocyanide is diamagnetic whereas potassium ferricyanide is paramagnetic.Reason : Crystal field splitting in ferrocyanide ion is greater than that of ferricyanide ion.

Assertion : ${\text{B}}_2$ molecule is diamagnetic.Reason : The highest occupied molecular orbital is of $\sigma$ type.

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?