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Chem Problems - #1 From the description suggest identities...

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Unformatted text preview: #1) From the description, suggest identities for the compunds D, E & F and explain the reactions involved: a) Powder D turned black when heated gently. The residue dissolved in dilute sulphuric acid without effervescence. When ammonia solution was added, a pale blue precipitate formed, which dissolved when further ammonia was added. b) Dark crystals of E dissolve in water to a purple solution which is rendered colorless by the addition of sodium thiosulphate. c) Separate portions of an aqueous solution of F were used for three tests: Addition of barium chloride solution gave a white precipitate insoluble in dilute hydrochloric acid. Reaction with magnesium ribbon gave a flammable gas. A nichrome wire dipped into the solution gave a bright yellow color in a flame. #2) How would you synthesize chromyl chloride (CrO2Cl2)? What precautions might you take? Is it likely to be a liquid or a solid at ordinary temperatures, and what is its likely color? ...
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