3. A Group III unknown is analyzed with the following results. State which ions are present, absent or questionable. The ppt. obtained when H2S (thioacetamide) is added in basic solution is partially soluble in HCl. Treatment of the HCl solution with NaOH and NaClO gives a strongly colored solution and a ppt. that is partially soluble in H2SO4. (1) Fe+2/Fe+3 definitely present definitely absent questionable (1) Al+3 definitely present definitely absent questionable (1) Zn+2 definitely present definitely absent questionable (1) Mn+2 definitely present definitely absent questionable (1) Cr+3 definitely present definitely absent questionable (1) Co+2 definitely present definitely absent questionable (1) Ni+2 definitely present definitely absent questionable (1) Cd+2 definitely present definitely absent questionable