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You were given an unknown which gave precipitates with all four test solutions, 1 M H2SO4, 0.25 M (NH4)2C2O4, 1 M K2CrO4and 1 M CH3COOH

You were given an unknown which gave precipitates with all four test solutions, 1 M H2SO4, 0.25 M (NH4)2C2O4, 1 M K2CrO4and 1 M CH3COOH and 1 M Na2CO3. Which of the four group II A metal cations are definitely absent from your unknown?

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