Lead sulfate is soluble in which of the following?

The group reagent for analytical group $IV$ is:

Which of the following ions forms a colored carbonate precipitate?

Which of the following solutions will yield a black precipitate when $H_2S$ gas is passed through it?

Which of the following is an incorrect match for the precipitate (ppt) and its color?

Which of the following statement$(s)$ is/are correct with reference to $Fe^{2+}$ and $Fe^{3+}$ ions?
$(1)$ $Fe^{3+}$ gives brown colour with potassium ferricyanide
$(2)$ $Fe^{2+}$ gives blue colour with potassium ferricyanide
$(3)$ $Fe^{3+}$ gives red colour with potassium thiocyanate
$(4)$ $Fe^{2+}$ gives brown colour with ammonium thiocyanate