Question

Which of the following is an example of pure substance?

• A. Pure water
• B. Gold
• C. Table salt
• D. All of the above

Answer 1

Answer: (D)

All of the above

Pure water always consists of two hydrogen and one oxygen atom. These atoms are chemically bonded to each other. Also pure gold consists of gold atoms only. Table salt (sodium chloride) cannot be separated by physical means and has a constant chemical composition. Hence, all the above examples are pure substances.