11. A solution contains cations Ag+, Pb2+, and Ni2+. Dilute solutions of NaCl, Na2SO4,
and Na2S are available to separate the cations from each other. In order to effective
separation, the solutions should be added in which order?
(A) Na2S, NaCl, Na2SO4 (B) Na2SO4, NaCl, Na2S
(C) Na2SO4, Na2S, NaCl
(D) NaCl, Na2S, Na2SO4 (E) NaCl, Na2SO4, Na2S
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