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Which of the following statements are correct?
(i) Gelatine sol if evaporated off it can be reobtained simply by mixing gelatine obtained on evaporation with suitable dispersion medium.
(ii) Metal sulphide sols need stabilising agents for their preservation
(iii) S_8 being a macromolecule forms macromolecular colloid.
(iv) Starch and proteins are natural whereas polythene and polystyrene are man-made macromolecules.
(v) Micelles are formed above kraft temperature at any concentration
(a) (i), (ii) and(iii)
(b) (i), (ii) and (iv)
(c) (iii), (iv) and (v)
(d) (ii), (iv) and (v)

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