Explain the following with suitable examples:
$(ii)$ Paramagnetism

(N/A) $(ii)$ Paramagnetism: The substances that are attracted by a magnetic field are called paramagnetic substances. Some examples of paramagnetic substances are $O_2$,$Cu^{2+}$,$Fe^{3+}$,and $Cr^{3+}$.
Paramagnetic substances get magnetised in a magnetic field in the same direction,but lose magnetism when the magnetic field is removed. To undergo paramagnetism,a substance must have one or more unpaired electrons. This is because the unpaired electrons are attracted by a magnetic field,thereby causing paramagnetism.