Question

Indigestion is painful. So to relieve indigestion, we take an antacid such as milk of magnesia, which contains:

• A. magnesium hydroxide
• B. hydrochloric acid
• C. tartaric acid
• D. calcium hydroxide

Answer 1

The correct option is A magnesium hydroxide

Milk of magnesia (also known as magnesium hydroxide; $Mg{\left(OH\right)}_2$) is basic in nature and one of the most important ingredients of an antacid.

The hydroxide ions from $Mg{\left(OH\right)}_2$) undergo neutralisation with $HCl$ in the stomach produced during indigestion or gastric problems, to produce water. Equation is as follows :

$2HCl+Mg{\left(OH\right)}_2\to Mg{\left(Cl\right)}_2+2H_{2}O$

Hence option $A$ is correct.