An aqueous solution contains following ions: Hg ₂²⁺, Hg ²⁺, Pb ²⁺ and Cd ²⁺ . On adding HCl , which of these will precipitate?

Step-by-step solution

Hg ₂²⁺ and Pb ²⁺ have been placed in I group of basic radicals as their K_ sp are less than the II group ions ( Hg ²⁺, Cd ²⁺ ) . Hence, only these will precipitate.