Which of the following is not precipitated as sulphide by passing $H_2S$ in the presence of concentrated $HCl$?

Which compound does not dissolve in hot dilute $HNO_3$?

Which of the following statements is incorrect regarding $Fe^{2+}$ and $Fe^{3+}$ cations?

The reagents $NH_4Cl$ and aqueous $NH_3$ will precipitate which of the following ions?

Which ion is not precipitated by both $HCl$ and $H_2S$?

$A$ metal salt solution forms a yellow precipitate with potassium chromate in acetic acid,a white precipitate with dilute $H_2SO_4$,but gives no precipitate with $NaCl$. The metal salt solution will consist of: