Which of the following can not be used as an antacid?

C a C O_{3}

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N a_{2} C O_{3}

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H_{2} C O_{3}

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K_{2} C O_{3}

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Solution

The correct option is C $H_{2} C O_{3}$
The bicarbonate ion ,a basic anion of a weak acid react with $H_{3} O^{+}$ from $H C l$ to form carbonic acid which decomposes to give carbon dioxide and water.Hence $H_{2} C O_{3}$ can not use as antacid.
$H C O_{3}^{-} + H_{3} O^{+} \to H_{2} C O_{3} + H_{2} O$
$H_{2} C O_{3} \to C O_{2} + H_{2} O$

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Which of the following can not be used as an antacid?

The correct option is C H2CO3The bicarbonate ion ,a basic anion of a weak acid react with H3O+ from HCl to form carbonic acid which decomposes to give carbon dioxide and water.Hence H2CO3 can not use as antacid.HCO−3+H3O+→H2CO3+H2OH2CO3→CO2+H2O