Rusting of an article made of iron is called:

Smoke and fog both are aerosols. In what way are they different?

$(i)$ Name the process or the separation technique you would follow to separate:
$(a)$ Dyes in black ink
$(b)$ Butter from cream
$(c)$ Ammonium chloride and common salt
$(d)$ Iron filings and sand
$(ii)$ State the principle used in separation by centrifugation.

How much water should be added to $15 \, g$ of salt to obtain a $15 \%$ salt solution (in $, g$)?

Why does a mixture not have a fixed melting or a fixed boiling point?

What happens when a hot saturated solution is cooled?