53. Which group of ions can exist together in water solution in moderate concentration?
(A) Ba^2+, NO^3–, K+, CO3^2–
(B) Ba^2+, Cl–, K+, SO4^2–
(C) K+, Cl–, Na+, NO^3–
(D) Ag+, NO^3–, K+, Cl–
(E) Na+, Pb^2+, Cl–, NO^3–

Question

53. Which group of ions can exist together in water solution in moderate concentration?
 (A) Ba^2+, NO^3–, K+, CO3^2– 
(B) Ba^2+, Cl–, K+, SO4^2–
 (C) K+, Cl–, Na+, NO^3–    
 (D) Ag+, NO^3–, K+, Cl–
 (E) Na+, Pb^2+, Cl–, NO^3–

anonymous · Answer

I know it is C, but can someone tell me why exactly?

cuanchi · Answer

take a look at the solubility rules (see attachment) and you will find in all the other ions combination you will have two ions that when combined are insoluble or with very low solubility