A colourless solid A produces black spots on skin, It's aqueous solution gives brown ring test and also gives yellow precipitate with potassium iodide. A could be :-

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The solid A produces black spots on skin, indicating it is corrosive or stains skin. The brown ring test confirms the presence of nitrate ions ( $N O_{3}^{-}$ ). A yellow precipitate with potassium iodide ( $K I$ ) indicates the presence of $A g^{+}$ ions (forming $A g I$ ). Silver nitrate ( $A g N O_{3}$ ) is a colourless solid that exhibits all these properties.

Therefore, A is Silver nitrate.

Chemistry - Salt Analysis Question with Solution | TestHub

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