Which of the following statements is NOT true about compounds?
Answer & explanation
Correct answer: option 4
The correct answer is option 4. Compounds have a variable composition.
The statement that is NOT true about compounds is Compounds have a variable composition.
Compounds have a fixed composition, meaning that the ratio of elements in a compound is always the same. This is known as the law of definite proportions. Each compound has a specific chemical formula that indicates the relative number of atoms of each element present in the compound. Therefore, compounds do not have a variable composition.