$(a)$ List any three characteristics of a colloid.
$(b)$ Name the two components of a colloid.
$(c)$ Identify colloids from the following mixtures:
Muddy water,sugar in water,ink,blood,soda water,foam.

State whether the following statement is true or false:
$A$ compound is a substance composed of two or more elements,chemically combined with one another in a fixed proportion.

Write one point of difference between concentration and solubility.

Fill in the blanks:
$(a)$ $A$ colloid is a .......... mixture and its components can be separated by the technique known as .........
$(b)$ Ice,water,and water vapour look different and display different ......... properties but they are ......... the same.
$(c)$ $A$ mixture of chloroform and water taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be of ......... and the lower layer will be that of .........
$(d)$ $A$ mixture of two or more miscible liquids,for which the difference in the boiling points is less than $25 \, K$,can be separated by the process called .........
$(e)$ When light is passed through water containing a few drops of milk,it shows a bluish tinge. This is due to the ......... of light by milk and the phenomenon is called ......... . This indicates that milk is a ......... solution.

Which of the following is a homogeneous mixture?

How can we obtain pure copper sulphate from an impure sample?