Which of the following are not intrinsic colloids?
I Starch
Sulphur
Arsenic sulphide
Ferric hydroxide
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Explanation:
Colloidal sols directly formed by mixing substances like gum, gelatine, starch, rubber, etc., with a suitable liquid (the dispersion medium) are called lyophilic sols.
Gelatin is a type of Lyophobic colloid and the separated dispersed phase and dispersion medium can be formed by simply mixing.
Similarly gum, starch, rubber are Lyophobic colloids.
In lyophobic colloids, the mixing of the dispersed phase and dispersion medium will not give the colloidal sol.
Arsenious sulphide, Ferric hydroxide, and Gold sol are various Lyophobic sols.
Hence, the Gold sol isn't a Lyophilic colloid and is wrongly matched.
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2
Answer:
A. starch
is the correct answer
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