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Question

A water soluble salt when treated with dilute hydrochloric acid produces brisk effervescence . The gas evolved turns lime water milky but has no effect on acidified potassium dichromate .the salt produce a white ppt. when treated with NaOH solution which remains insoluble in excess . Identify the cation and the anion present i the salt .

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Solution

A brisk effervesence is produced when dil HCl reacts with the salt. The gas producedturns lime water milky. So the gas is CO2 and the salt is carbonate salt.CaCO3 + 2HCl CaCl2 + CO2 + H2OCa(OH)2 + CO2 CaCO3 + H2OThe salt has no reaction with acidified potassium dichromate.Its soluble in NaOH gives white precipitate which is insoluble in excess.CaCO3 + 2NaOH Ca(OH)2 + Na2CO3So the given salt is CaCO3.Cationic part is Ca2+ and anionic part is CO32-

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