Why does a copper sulphate solution in water not show the Tyndall effect,while a mixture of water and milk does?

Two substances,$A$ and $B$,were made to react to form a third substance,$A_2B$,according to the following reaction: $2A + B \to A_2B$. Which of the following statements concerning this reaction are incorrect?
$(i)$ The product $A_2B$ shows the properties of substances $A$ and $B$.
$(ii)$ The product will always have a fixed composition.
$(iii)$ The product so formed cannot be classified as a compound.
$(iv)$ The product so formed is an element.

$A$ mixture containing two liquids visibly separated,is placed in a separating funnel. Answer the following:
$(i)$ What type of liquids form the mixture?
$(ii)$ Which of the liquids will form the lower layer?
$(iii)$ What is the principle behind this method of separation?

What volume of ethyl alcohol and water must be mixed together to prepare $250 \, mL$ of $60 \%$ by volume of alcohol in water?

How is a pure substance different from a mixture?

How will you separate a mixture of naphthalene powder and common salt? Draw a neat and labelled diagram to show the process.