Question

2. Which one of the following is not an example of a pute substance?
oxygen
air
copper
carbon dioxide​

Answer 1

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air

Explanation:

AIR IS NOT A PURE SUBSTANCE BECAUSE IT IS A HOMOGENEOUS MIXTURE OF DIFFERENT SUBSTANCES.

Answer 2

Answer:

Pure substance

What is a pure substance?

Pure substances are defined as substances that are made of only one type of atom or molecule.

Some examples of pure substance?

Oxygen,gold,hydrogen etc.

What are the pure substances in the options ?

Oxygen and copper

What are the Impure substance in the given options?

Air,Carbon-dioxide

Why is air a Impure substance?

Air contains many elements in it like nitrogen,oxygen .So air is a homogenous mixture.It cannot be considered as a pure substance.

Why is carbon-dioxide a Impure substance?

Carbon-dioxide is a compound of carbon and oxygen(CO2) so carbon-dioxide is not a pure substance.

Explanation: