$(a)$ What is the effect of temperature on the solubility of a solid in a liquid?
$(b)$ Why is it possible to distinguish the particles of solute from those of solvent in a suspension?

Three students $A, B$ and $C$ prepared mixtures using chalk powder,common salt and milk respectively in water. Whose mixture
$(i)$ would not leave residue on filter paper after filtration?
$(ii)$ would show Tyndall effect?
$(iii)$ would give transparent/clear solution?
$(iv)$ would settle down at the bottom when left undisturbed?
$(v)$ could be filtered by filter paper?

The 'sea-water' can be classified as a homogeneous as well as heterogeneous mixture. Comment.

Classify each of the following as an element,compound,or mixture:
Gold,Air,Marble,Milk,Sugar.

How will you separate a mixture of common salt $(A)$,camphor $(B)$ and iron filings $(C)$? Describe the process.

You are provided with a fine white-coloured powder which is either sugar or salt. How would you identify it without tasting?