question_answer

Which of the following are pure substances?

1.  Steam and water mixture in a container

2. Atmospheric air

3. Air and liquid air in a container

4. Gaseous combustion products

Select the correct answer using the codes given below:

Codes:

A) 1, 2 and 3 and 4

B) 2, 3 and 4

C) 1, 3 and 4                     

D) 1, 2 and 4