damp blue litmus paper red
lime water miky
lead ethanoate paper black
starch iodide paper blue-black
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The ans is D. Chlorine displaces iodine from starch iodide paper making the iodine to turn d paper blue black. Thats a test for chlorine.
This is indeed the correct choice for identifying the presence of chlorine gas, as the gas's reaction with water forms acids that turn blue litmus paper red. The earlier confusion regarding the behaviour of chlorine with litmus paper and the correctness of the options is cleared up with this explanation. Thus, Option A is the accurate answer to identify chlorine gas based on the options provided.
The selected answer is wrong:
it is iodine that turns starch blue black chlorine is sligtly acidic and therefore turns damp blue litmus paper red.
