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(C) The metal salt reacts with $K_2CrO_4$ in acetic acid to give a yellow precipitate and with dilute $H_2SO_4$ to give a white precipitate. These are

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Barium carbonate

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(C) The metal salt reacts with $K_2CrO_4$ in acetic acid to give a yellow precipitate and with dilute $H_2SO_4$ to give a white precipitate. These are characteristic tests for $Ba^{2+}$ ions. $Ba^{2+} + CrO_4^{2-} \rightarrow BaCrO_4$ (yellow precipitate). $Ba^{2+} + SO_4^{2-} \rightarrow BaSO_4$ (white precipitate). $Ba^{2+}$ does not form a precipitate with $Cl^-$ or $I^-$. When $Na_2CO_3$ is added to a solution containing $Ba^{2+}$,it forms $BaCO_3$ (white precipitate).

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