# Br- and I- ions give layer test, but Cl- ion doesn't. Why? [closed]

One of the questions I found in an NCERT book. Interestingly I could not find the answer anywhere on the internet. Hence, stack exchange.

## closed as unclear what you're asking by Tyberius, Mithoron, Mathew Mahindaratne, Jon Custer, tschoppiJul 11 at 5:54

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• Welcome to ChemSE. Please substantiate your question by addition of futher information providing (chemical) context + at least the start of your argumentation to solve the question. Layer of what? Since NCERT is an organisation, would it be a question about organic chemistry or inorganic chemistry or something else? – Buttonwood Jul 10 at 18:02
• @Buttonwood The organization NCERT writes textbooks for Indian schools which are colloquially called NCERT books, and the chemistry textbook contains organic, physical and inorganic chemistry together. And BTW I haven't come across this "Layer test" ever in it, but again I never read the book seriously. – William R. Ebenezer Jul 10 at 18:12
• @Soham can you type out how the "Layer test" described in the book? Some chemical context is mandatory. I can't find anything by that name anywhere. – William R. Ebenezer Jul 10 at 18:14

$$\ce{Br- + Cl2 -> Br2 + Cl-}$$ $$\ce{I- + Cl2 -> I2 + Cl-}$$