The compound insoluble in acetic acid is

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(C) The compound insoluble in acetic acid is $CaC_2O_4$ (Calcium oxalate).Acetic acid is a weak acid. When $CaCO_3$,$CaO$,or $Ca(OH)_2$ are added to a

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Calcium oxalate

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(C) The compound insoluble in acetic acid is $CaC_2O_4$ (Calcium oxalate).Acetic acid is a weak acid. When $CaCO_3$,$CaO$,or $Ca(OH)_2$ are added to acetic acid,they react to form soluble calcium acetate.However,$CaC_2O_4$ has a very low solubility product $(K_{sp})$ and is not soluble in weak acids like acetic acid because the concentration of oxalate ions $(C_2O_4^{2-})$ is not significantly reduced by protonation to a level that would dissolve the precipitate.

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