AgI, Ni(OH)2, KClO4, SrSO4, CaCO3
For AgI the acid would be HI and that is a strong acid; therefore, AgI is NOT more soluble in acid than in water.
For Ni(OH)2, adding H^+ reacts with OH to form H2O so YES, it is more soluble in acid than in H2O
For KClO4, adding H^+ forms HClO4 but that is a strong acid so it is NOT more soluble in acid.
SrSO4 would be HSO4^- and that is k2 for H2SO4 so YES.
CaCO3 would be HCO3^- which is k2 for H2CO3 and YES.
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