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A colorless, transparent solution may contain some of Na+, Cu2+, NH4+, Cl−, CO32− and SO42−. Two experiments are done. (1) NaOH solution is added to a sample and heated; a gas that turns moist red litmus paper blue is released. (2) Excess Ba(NO3)2 solution is added to another sample, giving a white precipitate; after filtration, excess dilute nitric acid is added to the precipitate, which dissolves completely with a colorless gas given off. Which conclusion is correct? ( ).
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