20 13 On the afternoon of May 3, workers in a bleaching workshop of a paper mill in Fufeng County, Baoji City, Shaanxi Province mistakenly screwed the valve of the chlorine tank, resulting in chlorine

20 13 On the afternoon of May 3, workers in a bleaching workshop of a paper mill in Fufeng County, Baoji City, Shaanxi Province mistakenly screwed the valve of the chlorine tank, resulting in chlorine leakage. A. The chemical properties of thiocyanate [(SCN)] are similar to Cl2, and it can react with alkali and calcium hydroxide to be absorbed, so A is correct;

B. Ferric chloride reacts with potassium thiocyanate solution to form a complex, which makes the solution blood red, so B is correct;

C. reducing SCN- > cl-, so chlorine can oxidize SCN- to (SCN)2, and the ionic equation of the reaction is Cl2+2SCN-═(SCN)2+2Cl-, so C is correct;

D. Reducing SCN-> Br-, (SCN)2 can't oxidize Br- to Br2, so thiocyanate and bromide ions don't react, so D is wrong;

So choose D.