What leads to the formation of an ionic bond with hg22+?
a) the attraction of a noble gas
b) the attraction of an nh4+ ion
c) the attraction of a group 1 element
d) the attraction of an so42– ion

The correct answer is option D.

Explanation:

ionic bond are defined chemical bonds in which complete transfer of an electrons takes place between twp oppositely charged ions.

So, mercury ion with positive charge will get attracted towards the negatively charged ion that is ion with excess of electrons. And that ion from the given options is sulfate ion.

Hence, the correct answer is option D.