Question

Question 25
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 are 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 ______ 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.

Answer 1

(a) A colloid is a heterogeneous mixture and its components can be separated by the technique known as centrifugation.

(b) Ice, water and water vapour look different and display different physical properties but they are chemically the same.

(c) A mixture of chloroform and water are taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be of water and the lower layer will be that of chloroform (It is because water is lighter than chloroform).

(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 fractional distillation.

(e) When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the scattering of light by milk and the phenomenon is called Tyndall effect. This indicates that milk is a colloidal solution.