Question

Which of the following suspensions is prepared by chemical reaction?

• A. Milk of magnesia
• B. Aluminium hydroxide
• C. Calcium carbonate
• D. Magnesium carbonate

Hint:

Milk of Magnesia is a "Precipitated Suspension"—formed by a chemical reaction for extra fineness.

Answer 1

The Correct Option is A

Step 1: Concept
Some pharmaceutical suspensions are formed through a precipitation method where chemical reactants combine to form an insoluble fine precipitate.

Step 2: Meaning
This ensures the resulting particles are extremely fine and uniform, providing better stability and neutralizing capacity.

Step 3: Analysis
Milk of Magnesia (Magnesium Hydroxide Mixture) is typically prepared by reacting magnesium sulfate with sodium hydroxide or by the hydration of light magnesium oxide.

Step 4: Conclusion
Due to this double decomposition or hydration process, it is considered a suspension prepared by chemical reaction.

Final Answer: (A)