Which of the following bases is used as an antacid to neutralize stomach acidity?

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$KOH$

$M g {(O H)}_{2}$

$NaOH$

$C a {(O H)}_{2}$

answer is D.

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Detailed Solution

An entire class of medications known as antacids is used to counteract gastric acid. They contain components that act as bases (alkalis) to balance stomach acids, such as aluminum, calcium, magnesium, or sodium bicarbonate.
Strong bases shouldn't be used as antacids since they can harm the body's important organs and stomach by altering the pH of the tissues. An antacid reacts with the body's excess acid production, neutralizes it, and provides relief for the user. Tablets and liquid antacids are both available. Some products contain alginates or a combination of multiple antacid substances.

Antacids are drugs used to decrease stomach acidity. For this basic substances are used. Strong bases can't be used for this purpose it can cause potent health issues while intake. In the given options $NaOH$ , $KOH$ and $C a {(O H)}_{2}$ are strong bases as they completely ionize in water. Thus weak base $M g {(O H)}_{2}$ can be used as an antacid.