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  • 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.

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.

Answers (1)

Solution:
(a) heterogeneous; centrifugation
Colloid: It is heterogeneous mixture of tiny particles which perform random motion and cannot be separated by gravity.
Centrifugation: on rotating container particle are repelled towards wall.
(b) physical, chemically
Physical Property: appearance, state etc.
Chemical Property: capability to react with some other substance.
(c) water, chloroform
Density of water (1 gram per cc) is less than density of chloroform ( 1.49 gram per cc)
(d) fractional distillation
Example: Acetone (boiling point = 56^{\circ}C) and water (boiling point = 100^{\circ}C)
(e) scattering, Tyndall effect, colloidal
Milk is a heterogeneous colloidal of water, fat and protein etc.

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