Which of the following silver precipitates dissolves in $dil. \, HNO_3$ to produce a clear solution?

The $Chromyl$ $Chloride$ test is performed to detect which of the following ions?

$A$ salt solution is treated with chloroform drops. Then it is shaken with chlorine water. The chloroform layer becomes violet. The solution contains:

During the detection of an acidic radical present in a salt,a student obtains a pale yellow precipitate that is soluble with difficulty in $NH_4OH$ solution when the sodium carbonate extract is first acidified with dil. $HNO_3$ and then $AgNO_3$ solution is added. This indicates the presence of:

Which reagent is used to remove $SO_4^{2-}$ and $Cl^{-}$ ions from a solution?

Sodium nitroprusside,when added to an alkaline solution of sulphide ions,produces a purple colour due to the formation of: