The decolourization of purple colour of tetraoxomanganate (VII) ion is a test for? by Sunday | Oct 14 | Chemistry JAMB | 0 comments A. alkenes B. alkanols C. alkanals D. alkanes Correct Answer: Option A – alkenes Users Also Read These:The following will decolourize acidified potassium…A purple colour was obtained when sodium hydroxide…In the laboratory preparation of chlorine from…The colour of the solution formed when ethyne reacts…The salt that reacts with dilute hydrochloric acid…