Question

which of the following are mixtures?
select all that apply
a air
b copper
c sand
d tea
e water
f oxygen

Explanation:

• Air: It is a mixture of gases like nitrogen (\(N_2\)), oxygen (\(O_2\)), carbon - dioxide (\(CO_2\)), and others.
• Sand: It is a mixture of silicon dioxide (\(SiO_2\)) and various other minerals.
• Tea: It is a mixture of water, tea - leaves extract, and sometimes sugar, milk etc.
• Copper: It is an element (a pure substance), not a mixture.
• Water (\(H_2O\)): It is a compound (a pure substance), not a mixture.
• Oxygen (\(O_2\)): It is an element (a pure substance), not a mixture.

Answer:

A. air, C. sand, D. tea