Question

Which of the following cannot be classified as a substance? gold table salt nitrogen air Description

Answer 1

Air is a mix of several substances.

Answer 2

Answer: Air

Step-by-step explanation:

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: table salt
`NaCl`

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Gold
`Au` , nitrogen
`N_2`

Mixture is defined as a composition which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air