Question

Which of the following groups of ions can exist in a water solution WITHOUT forming a precipitate?

  

Ag⁺, NO₃^- , Na⁺, Cl ^-

  

K⁺, NO₃^- , Na⁺, CH₃COO ^-

  

Hg₂²⁺, S^2-, Li⁺, NO₃^-

  

Pb²⁺, Cl ^- , K⁺, SO₄^2-

  

Ba²⁺, PO₄^{3 -}, Ca²⁺, SO₄^2-

Answer 1

Ans: Only following group of ions will exist in solution..

K+, NO3- , Na+, CH3COO-      ----- Does not forms any ppt, Hence all ions will exist in solution

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Ag+, NO3- , Na+, Cl-            ---- Forms the ppt of AgCl – Hence all ions cannot exist in solution

Hg22+, S2-, Li+, NO3-   ---- Forms the ppt of HgS – Hence all ions cannot exist in solution

Pb2+, Cl- , K+, SO42-            ---- Forms the ppt of PbSO4 – Hence, all ions cannot exist in solution

Ba2+, PO43-, Ca2+, SO42- ---- Forms the ppt of BaSO4 – Hence, all ions cannot exist in solution