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For which of following set of cations,al...

For which of following set of cations,all can be precipitated with KI(aq)?
(a) Cu2+, Zn2+, Ni2+
(b) Na+, Mg2+, Ca2+
(c) Ag+, Hg22+, Pb2+
(d) Ag+, Ca2+, Sr2+

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