Question

Question #7f216

Answer 1

In Rxn 1, `ZnCl_2` is a soluble Halide Salt, but `CaCO_3` is an insoluble Alkali Earth Carbonate (ppt).
In Rxn 2. Both `H_2O` and `ZnCl_2` are soluble and remain in solution => no ppt.

`CaCO_3` is the only compound that will be insoluble based upon the given reactants of the metathesis reactions in the question.

Explanation:

The simplest answer is found in the solubility rules ...
From solubility rules one finds that all Metal Halide salts are soluble except for Mercury (Hg), Silver (Ag) or Lead (Pb) halides. That is, remember HAPy Halides => Hg Ag Pb.

Also from the solubility rules all metallic carbonates are 'insoluble' except for Gp IA carbonates and ammonium (or, amine) carbonate derivatives.

Oh, and answer choice 'C' is an insoluble transition metal carbonate, but is not part of the product sets that can be defined from the reactants in the given metathesis reactions