Which of the following is not a property of compounds?

• (A) They are made up of two or more kinds of atoms.
• (B) They cannot be broken down into two or more simpler substances by physical means but by chemical means only.
• (C) Properties of compounds differ from those of their elements.
• (D) None of the above.

To determine which option is not a property of compounds, let's analyze each statement:

Option Analysis

• (A) Compounds are indeed made up of two or more different kinds of atoms. This statement is true.
• (B) Compounds cannot be separated into simpler substances by physical means; they require chemical reactions for breakdown. This statement is also true.
• (C) The properties of compounds are different from those of the individual elements that compose them. This is a true statement as well.
• (D) This option suggests that none of the previous statements are incorrect.

Final Thoughts

Since all the properties listed in options (A), (B), and (C) are accurate descriptions of compounds, the correct answer is (D) None of the above, meaning all the statements are indeed properties of compounds.