A student adds an excess of dilute hydrochloric acid to a green solid, XXX. A rapid effervescence is observed, producing a gas, YYY, and leaving a blue-green solution. When gas Y Y\,Y is bubbled through a colorless solution, ZZZ, a white precipitate is formed.
Which of the following correctly identifies XXX, YYY, and ZZZ?
X=FeCO3(s)X = \text{FeCO}_3\text{(s)}X=FeCO3(s), Y=CO2(g)Y = \text{CO}_2\text{(g)}Y=CO2(g), Z=BaCl2(aq)Z = \text{BaCl}_2\text{(aq)}Z=BaCl2(aq)
X=CuCl2(s)X = \text{CuCl}_2\text{(s)}X=CuCl2(s), Y=Cl2(g)Y = \text{Cl}_2\text{(g)}Y=Cl2(g), Z=KI(aq)Z = \text{KI(aq)}Z=KI(aq)
X=CuCO3(s)X = \text{CuCO}_3\text{(s)}X=CuCO3(s), Y=CO2(g)Y = \text{CO}_2\text{(g)}Y=CO2(g), Z=Ca(OH)2(aq)Z = \text{Ca(OH)}_2\text{(aq)}Z=Ca(OH)2(aq)
X=NiCO3(s)X = \text{NiCO}_3\text{(s)}X=NiCO3(s), Y=CO2(g)Y = \text{CO}_2\text{(g)}Y=CO2(g), Z=NaOH(aq)Z = \text{NaOH(aq)}Z=NaOH(aq)
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