Question detail
A student is testing formulation. Which choice keeps the observation and conclusion correctly linked?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Purity, formulations and chromatography
Question
- A. A formulation is always a single element
- B. A formulation is a mixture, while a pure substance is not
- C. A formulation cannot be used in products
- D. A formulation is always impure
Answer
The correct answer is A formulation is a mixture, while a pure substance is not. It matches formulation because the evidence is designed mixture composition and the expected result is useful product properties.
Explanation
The correct option is A formulation is a mixture, while a pure substance is not. The important distinction is that formulation must be identified from designed mixture composition; answers that swap in a different test or result do not match Formulations. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Misunderstanding Formulations
Students often think that formulations can be made with any random mixture of components without precise measurements.
Emphasize that formulations are specifically designed mixtures where components are mixed in carefully measured quantities to achieve desired properties.
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