Question

Which of the following is an example of physical incompatibility:

• A. Alkaloidal incompatibility
• B. Liquefaction
• C. Drug interaction
• D. Error in dosage form

Answer 1

The Correct Option is B

The correct option is (B): Liquefaction.

Answer 2

The question asks which of the given options is an example of a physical incompatibility. Let's check what type of incompatibility each option represents.

1. Alkaloidal incompatibility: This occurs when an alkaloid salt reacts chemically with another substance, such as a tannin or an alkaline compound, to form an insoluble precipitate. This is a chemical incompatibility, since a new chemical species is formed.
2. Liquefaction: This happens when two or more solid substances, such as camphor and menthol, are mixed together and the mixture turns into a liquid at room temperature because of a eutectic effect. No new chemical compound is formed; it is simply a change in physical state caused by the interaction of the mixed solids. This makes it a physical incompatibility.
3. Drug interaction: This describes one drug altering the effect of another drug in the body, which is classified as a therapeutic incompatibility, not a physical one.
4. Error in dosage form: This refers to a formulation or manufacturing mistake, not an interaction between ingredients, so it does not fit any of the three classic incompatibility categories, physical, chemical, or therapeutic, at all.

Liquefaction is the option that involves a purely physical change, a solid mixture turning liquid, without any new chemical bond forming, which is the defining feature of a physical incompatibility.

Therefore, the correct answer is Liquefaction.