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The compound insolubel in acetic acid is

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The compound insolubel in acetic acid is
A. Calcium oxide
B. Calcium carbonate
C. Calcium oxalate
D. Calcium hydroxide
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Correct Answer - C
`CaO,CaCO_(3)and Ca(OH)_(2)"dissolve in"CH_(3)COOH "to from" (CH_(3)COO)_(2)Ca. But CaC_(2)O_(4)` does not dissolve as `CH_(3)COO^(-)` is a stronger conjugate base than `C_(2)O_(4)^(2-).`
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