WAEC - Chemistry (2012 - No. 19)
A sample of a gas may be identified as chlorine if it turns
damp blue litmus paper red
lime water miky
lead ethanoate paper black
starch iodide paper blue-black
Wyjaśnienie
A test for chlorine is to place damp starch-iodide paper into a test tube of chlorine. A positive result for chlorine is indicated by the paper turning from white to blue-black.