(a) List any four properties of a colloid and mention any two properties in which colloids differ from suspension.
(b) State what is Tyndall effect ? Which of the following solutions will show Tyndall effect ? Starch solution, sodium chloride solution, Tincture iodine, air
Answers
Explanation:
(a) Properties of a colloid (any four)
(i) A colloid is a heterogeneous mixture.
(ii) The size of particles of a colloid is too small to be individually seen by naked eyes.
(iii) Colloids are big enough to scatter a beam of light passing through it and make its path visible.
(iv) They do not settle down when left undisturbed, that is, a colloid is quite stable.
(v) They cannot be separated from the mixture by the process of filtration. But, a special technique of separation known as centrifugation can be used to separate the colloidal particles.
Two properties in which colloids differ from suspension are (ii) and (iii) as the particles of a suspension are large enough to be observed with a naked eye and these particles settle down well when the mixture is left undisturbed.
(b) Tyndall effect is the phenomenon of scattering of a beam of light by the particles of a colloid.
Starch solution and tincture iodine are colloid and thus will show a Tyndall effect.
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