Which of the following is sparingly soluble in cold water and fairly soluble in hot water?

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

$A$ metal nitrate reacts with $KI$ to give a black precipitate which on addition of excess of $KI$ converts into an orange-colored solution. The cation of the metal nitrate is

Which of the following compounds will not give a positive chromyl chloride test?

Which reagent is used to test for the presence of the $Fe^{+2}$ ion?

$A$ mixture of two salts is not water-soluble but dissolves completely in dilute hydrochloric acid to form a colourless solution. The mixture could be