I think the dust in air is neither a colloid, a suspension nor a solution.
REASONS:
1. You can not say that it is a colloid because the common characteristic of a colloid is sticky like lotions and gels;
2. You can not say that it is a suspension because if it is, we should be able to identify easily the solid particles in the air which is the dust;
3. You can not say that it is a solution because it should form only liquid phase as result.
Though I don't think is it is a colloid, a suspension, or a solution, I am sure that it is MIXTURE.
Air is neither a colloïd solution nor suspension. It is quite the opposite: a homogeneous mixture, like ALL gases do: there is only ONE existent gas phase .
A colloid.
Yes, suspended silt would count as a colloid.
For example a dust.
Sand is made form a mixture of mineral grains (mainly quartz or calcite) which are themselves compounds. If there is water or air flowing though the sand at a fast rate, then it can also be a suspension.
If you understand "dust free air", this is simply a mixture of gases.
colliod
Air is neither a colloïd solution nor suspension. It is quite the opposite: a homogeneous mixture, like ALL gases do: there is only ONE existent gas phase .
Yes
It is a suspension of dust particles in a mixture of gases. The latter may be considered a solution of other gases in nitrogen.
the size of its largest particle
A colloid.
yes
air is a solution
Yes, suspended silt would count as a colloid.
No. Except for dust storms.
For example a dust.