Homework Answers
This is based on common ion effect.
HgCl2 can dissociate into ions as HgCl2 → Hg2+(aq) + 2Cl-(aq)
Any substance which contains these two ions can decrease the solubility by common ion effect (more better by Lechatlier's principle).
AgCl, NaCl have common ions Cl-, and adding one of the product Hg2+ also decreases solubility.
So correct option goes to adding more solid substance HgCl2.
Hope this helped you!
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