(C) $Na_2CO_3$ (sodium carbonate) is strongly alkaline and is not used as an antacid because it can be corrosive to the stomach lining. Antacids are m

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(C) $Na_2CO_3$ (sodium carbonate) is strongly alkaline and is not used as an antacid because it can be corrosive to the stomach lining. Antacids are mild bases that neutralize excess stomach acid. $Al(OH)_3$,$Mg(OH)_2$,and $NaHCO_3$ are commonly used as antacids to provide relief from acidity.