NDA 2025
- Exam
- NDA
- Year
- 2025
- Subject
- General Ability
- Chapter
- General Science
NDA 2025 · General Ability · General Science
Which one of the following statements about a compound is NOT...
Which one of the following statements about a compound is NOT correct?
Options
- AA compound is a substance composed of two or more elements, chemically combined in a fixed proportion
- BProperties of a compound are different from its constituent elements
- CA compound is an impure substance
- DThe constituents of a compound can be separated only by chemical or electrochemical reactions
Correct answer
C. A compound is an impure substance
Step-by-step solution
A compound is a pure substance because it consists of molecules of only one kind, which are formed by the chemical combination of two or more elements in a fixed ratio by mass.
The properties of a compound are entirely different from those of its constituent elements.
The constituents of a compound cannot be separated by physical methods but can be separated by chemical or electrochemical methods.
Therefore, the statement that a compound is an impure substance is incorrect.
Answer: A compound is an impure substance
The properties of a compound are entirely different from those of its constituent elements.
The constituents of a compound cannot be separated by physical methods but can be separated by chemical or electrochemical methods.
Therefore, the statement that a compound is an impure substance is incorrect.
Answer: A compound is an impure substance