Which of the following compounds is used as an antacid?

Correct option is C

The correct answer is: (C) Magnesium hydroxide

• Magnesium hydroxide (Mg(OH)₂) is commonly used as an antacid to treat conditions like acid reflux and indigestion. It works by neutralizing excess stomach acid.

• It is often found in milk of magnesia, a common over-the-counter antacid.

• Calcium hydroxide (Ca(OH)₂) is used in small amounts as an antacid, but it is more commonly used in other applications like water treatment.

• Calcium oxide (CaO) is highly alkaline and is not used directly as an antacid. It is mainly used in industrial processes like cement making.

• Sodium chloride (NaCl) is table salt and is not used as an antacid.

• Antacids help neutralize stomach acids and provide relief from heartburn or acid indigestion. Other common antacids include aluminum hydroxide and sodium bicarbonate.