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

Hint: Pure substances are defined as substances that are made up of only one type of atom or only one type of molecule (a group of atoms bonded together). The measure of whether the substance is pure is known as purity.

Complete answer:
The pure substance within chemistry may be a very simple concept to know. Pure substances are defined as substances that are made from just one kind of atom or only 1 variety of molecule (a group of atoms bonded together). The measure of whether a substance is pure is understood as purity. For instance, pure iron would only contain iron atoms, and, as within the sugar cube mentioned above, pure sugar would only contain molecules of the substance called sucrose.
Pure substances exhibit very well-defined physical properties, or properties that aren't connected with the substance's ability to mix with different substances. The temperatures where pure solids melt, called melting points, are particularly sharp, meaning the melting occurs at one temperature. Likewise, the temperatures where pure liquids begin to boil, or boiling points, occur at single temperatures when other factors, like gas pressure, are controlled. the flexibility of gear to conduct electricity, or conductivity, is profoundly stricken by purity. for instance, copper that's employed in electrical wiring must have very high purity so as to produce the foremost efficient conductivity. On the opposite hand, extremely pure liquid water may be a very poor conductor of electricity because there are not any dissolved electrical conductors, called electrolytes, to permit conduction to occur.
Now let's come to the answer.
Pure water always consists of two hydrogen and one oxygen atom. These atoms are chemically bonded to every other. Also pure gold consists of gold atoms only. flavourer (sodium chloride) can't be separated by physical means and encompasses a constant chemical composition. Hence, all the above examples are pure substances.

So the correct option is d that's all of the above.

Note:
The best examples of pure substances are pure elements, molecules, and compounds like
Hydrogen gas.
Gold metal.
Sugar (sucrose)
Baking soda (sodium bicarbonate)
Ammonia.
Diamond.
Copper wire.
Silicon chip.