Q. Define:
(i) Fluid
(ii) Buoyant force
Ans. (i) The states of matter that can flow due to less intermolecular force of attraction and have no fixed shape, are called as fluids. For example: Liquids and gases.
(ii) Buoyant force: It is the upward force exerted by any fluid upon a body placed in it.
Q. List any three properties on the basis of which a colloidal solution can be recognized.
Ans. Following are the properties that can help distinguish a colloidal solution: (Write any three)
(i) The particles in a colloidal solution are too small to be viewed by naked eyes. These particles can be observed only through an ultra microsope.
(ii) Particles of a colloidal solution do not settle down when left undisturbed.
(iii) Colloidal solutions cannot be filtered using a filter paper.
(iv) Colloidal solution is heterogeneous a solution.
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