Question

Which of the following is a homogenous mixture of two or more pure substances?

A. water
B. air
C. alcohol
D. oxygen

#2: You run a chromatogram of inks belonging to three crime suspects and from a ransom note. The inks resolve into the following numbers of spots: suspect A = 2, suspect B = 4, suspect C = 3, note = 5.

Which suspect would you most likely bring in for questioning?

A. suspect A

B. suspect B

C. suspect C

D. none of the suspects

Answer 1

1. The answer to this question would be air.
Air contains oxygen, nitrogen, carbon dioxide so it was a mixed one. The other option is a compound(water, alcohol) or molecule(oxygen) so it's not a mixture.

2. The answer to this question would be D. none of the suspects.
Since the note is 5 spots so there is no match for the suspect. But if you looking for the most suspicious then it could be suspect B with 4 spot which was near 5