Question

A copper salt is isomorphic with $ZnSO_4$, the salt will be?
(A) Diamagnetic
(B) Paramagnetic
(C) Ferromagnetic
(D) None

Answer 1

Hint : Isomorphism in crystal crystallography can be defined as the – crystals are described as isomorphous if they have closely similar shapes. Previously the shapes of the crystals and the similarities between the different crystals were determined by measuring the angle between the crystal’s face using a device called a goniometer.

Complete Step By Step Answer:
To proceed with this question, we have to keep in mind the magnetic properties of the sample i.e. whether the sample is diamagnetic, paramagnetic or ferromagnetic.
So, the magnetic property of the material depends upon the number of unpaired electrons present in its valence orbital as electrons play a great role in participating in the various phenomena.
So, proceeding with the given question:
We know that
$ZnS{O_4} \to Z{n^{2 + }} + SO_4^{2 - }$
Zinc sulphate consists of the ions zinc positive and sulphate negative.
Also we are aware of the fact that: (as given in the question),
Isomorphic with $Z{n^{2 + }} C{u^{2 + }}$
As the electronic configuration plays an important role, so writing the electronic configuration of $C{u^{2 + }}$ we have:
$C{u^{2 + }} \to [Ar]3{d^9}$
So, as we can see, it has only $1$ unpaired electrons in the valence orbital.
So the substance is paramagnetic.
Thus, we can say that the correct option is B i.e. Paramagnetic. Therefore A copper salt is isomorphic with ZnSO4, the salt will be paramagnetic.

Note :
To be clear with the term paramagnetic, the paramagnetic substances are those substances which are not strongly attracted towards the magnetic field. Whereas the diamagnetic substances are repelled by the magnetic field but the ferromagnetic substances can be defined as the substances which are strongly attracted towards the magnetic field.