(a)  Tripositive and tetrapositive ions are rare when compared to dipositive an unipositive ions.

Dear student

Yes, tripositive and tetrapositive ions are rare when compared to dipositive and unipositive ions.
Unipositive ions are those which have a unit positive charge, for ex , Na+
Dipositive ions are those which have two units of positive charge , for ex, Mg2+

Tripositive and tetrapositive ions are  obtained by the removal of three electrons and four electrons respectively from the neutral atom.So in order to obtain these ions, a very high ionisation energy is required. Such high ionisation energy is not available in most of the chemical reactions. Hence the formation of these ions is very rare.


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