Which of the following substance is an antacid?

N a C l

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M g (O H)_{2}

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H C l

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H_{2} S O_{4}

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Solution

The correct option is A $M g (O H)_{2}$
Due to its mildly basic and non-toxic nature, magnesium hydroxide is widely used as an antacid to neutralize stomach acids and prevent indigestion and heartburn.

It is also used as a laxative, antiperspirant, underarm deodorant, to treat sores, in wastewater treatment, and as a fire retardant.

Therefore, the correct option is B.

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