Chalk is not a mixture it is a chemical compound called Calcium carbonate.
Sublimation
First you can mix the salt and chalk together in water. Then using filtration, you can filter the chalk out. Lastly, using evaporation to get salt.
A physical change.
Chalk particles can be collected by using a filtration process. A filter paper or a fine sieve can be used to separate the dissolved chalk particles from the water. The water can then be evaporated to obtain the solid chalk residue.
A mixture of sugar and chalk is heterogeneous.
chalk is a compound
Chalk is not a mixture it is a chemical compound called Calcium carbonate.
chalk is a compound
it is a mixture of white paint and white chalk
Chalk is Calcium Carbonate, aka CaCO3, so it's only one substance.
This is a suspension.
compound
treatment of diarrhoea
You can add water to this mixture, which will dissolve the salt but not the chalk. Decant the water, then boil it away, and you will be left with salt.Salt is much more soluble in water than chalk is.
Chalk consists of calcium carbonate. It would be a heterogeneous mixture if colours were added to it.
Use a magnet to remove the iron filings from the mixture, then mix the remaining components with water. The copper sulfate will dissolve but the CaCO3 (chalk powder) will not. Filter the mixture to remove the chalk, then boil the water to recover the copper sulfate.