Which one of the following statements about a compound is NOT correct?
- A. A compound is a substance composed of two or more elements, chemically combined in a fixed proportion
- B. Properties of a compound are different from its constituent elements
- C. A compound is an impure substance ✓
- D. The constituents of a compound can be separated only by chemical or electrochemical reactions
Correct Answer: C. A compound is an impure substance
Explanation
A compound is a pure substance, not an impure one, as it consists of identical molecules made of two or more elements chemically combined in fixed proportions.
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