Question

The solubility of a salt increases if the salt can form a complex ion with other species in the solution. If true write 1, else write 0.

Answer 1

The solubility of a salt increases if the salt can form a complex ion with other species in the solution.

For example, $Hg{I}_2$ forms soluble complex with $KI$

$2KI+Hg{I}_2⟶K_{2}Hg{I}_4$

So solubility of $Hg{I}_2$ in water increases in presence of $KI$.