Discussion
Which of the following statements are not true regarding compounds ?
(A) Compounds show the properties of constituent substances.
(B) Only elements can react to form compounds.
(C) The composition of each compound is always fixed.
(D) Compounds can be separated by physical and chemical methods.
Answer: D
The statements that are not true are (A), (B) and (D).
(A) is false: a compound has properties different from its constituents, as water differs from hydrogen and oxygen. (B) is false: compounds also react with elements or other compounds to form new compounds. (D) is false: compounds can be separated into their elements only by chemical methods, not physical ones.
(C) is true, since every compound has a fixed composition by mass (the law of constant proportions), so any option including (C) is wrong.
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