Give a chemical test to identify the following gases chlorine ...
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When HCl gas is passed through AgNO3 solution, white precipitates of AgCl are formed which gets dissolved in excess of NH4OH. (iv) Chemical test for Chlorine: It turns moist starch iodide paper (KI + starch solution) blue-black. ... This gas is absorbed in colourless alkaline solution of pyrogallol and turns it dark brown.
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