Question

Three metal ions x⁺², y⁺², z⁺² are identify in qualitative analysis. Nitrates of x⁺², y⁺², z⁺² dissolve in three seprate test tubes and gives following observation.
i) All solution produce carbonate precipitate with (NH₄ )₂CO₃
ii) Only one produce white ppt on addition of NaCl.
iii) Out of 3 cations two produce sulphide ppt.
iv) Sulphide of y⁺² is not produce by H₂S/H⁺ but produce when H₂S is passed in basic medium.
v) Only y⁺² produce soluble sulphate
vi) x ⁺² gives no ppt with dil NH₄OH
Select correct about xCO₃ , y CO₃ , z CO₃ -

1. All are soluble in dil. H₂SO₄    
2. All are soluble in dil HCl    
3. None is soluble in dil. H₂SO₄    
4. Except ZCO₃ all are soluble in dil. HCl