Question

How could you distinguish between the gases h2 and no2?

Answer 1

H2 is colorless and odorless
NO2 is brown, pungent, and toxic

Answer 2

Step-by-step explanation:

A molecule is defined as a substance which contains chemically bonded same type of elements.

For example,
`H_(2)` is a molecule and it exists as a gas which is colorless and odorless.

Hydrogen gas is represented as
`H_(2)`.

Whereas a compound is defined as a substance which contains chemically bonded different type of elements in a fixed ratio by mass.

For example,
`NO_(2)` is a compound and has a reddish brown color with toxic odor.

Nitrogen dioxide is represented as
`NO_(2)`.