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The sodium salt of a carboxylic acid A was produced by passing a gas B into an aqueous solution of caustic alkali at an elevated temperature and pressure. A on heating in presence of sodium hydroxide followed by treatment with sulphuric acid gave a dibasic acid C. A sample of 0.4 g of acid C, on combustion gave 0.08 g of water and 0.39 g of carbon dioxide. The silver salt of the acid weighing 1.0 g on ignition yielded 0.71 g of silver as residue. Identify A , B and C.

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 (i) A is sodium salt of a carboxylic acid produced by a gas B on reacting with NaOH at high p and T The reaction is a characteristic reaction of CO2 aird NaOH at high P and T.

(iii) The data given for C also confirms that it is oxalic acid.

For empirical formula of C :

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