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Which compound is used as an antacid?

1. Soda ash
2. Baking soda
3. Nitrous oxide
4. Magnesium carbonate

Correct answer: Magnesium carbonate

Solution

Magnesium carbonate is a basic salt that can neutralize excess hydrochloric acid in the stomach, so it is used as an antacid. The other options are not standard antacid compounds in this context.

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