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Which compound forms double salt with sulphates of alkali metals?(a) Ferric oxide(b) Silver nitrate(c) Ferric chloride(d) Ferrous sulphateThis question was posed to me in an interview for job.My question is based upon D and F-Block Elements topic in chapter D and F-Block Elements of Chemistry – Class 12 |
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Answer» CORRECT answer is (d) Ferrous sulphate Explanation: Ferrous sulphate forms double salts with sulphates of alkali METALS with general formula R2SO4.FeSO4.6H2O. With ammonium sulphate, it forms a double salt known as Mohr’s salt. It ionises in solution to gives Fe^2+, NH4^+ and SO4^2- IONS. |
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