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Match List-I with List-II
List-I List-II
(A) Lyophilic colloid
(I) Liquid-liquid colloid

(B) Emulsion
(II) protective colloid
(C) Positively charged
$(III) {FeCl}_{3} + NaOH$
(D) Negatively charged
colloid $(IV) {FeCl}_{3} + hot water$
Choose the correct answer from the options given below:

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$(A) - (III), (B) - (II), (C) - (I), (D) - (IV)$

$(A) - (III), (B) - (I), (C) - (IV), (D) - (II)$

$(A) - (II), (B) - (I), (C) - (IV), (D) - (III)$

$(A) - (II), (B) - (I), (C) - (III), (D) - (IV)$

answer is A.

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Detailed Solution

(A) Protective colloids are lyophilic colloids
(B) Emulsions are liquid in liquid colloidal solutions

(C) ${FeCl}_{3} +$ hot water forms positively charged colloidal solution of hydrated ferric oxide due to preferential adsorption of Fe⁺³ ions
(D) ${FeCl}_{3} + NaOH$ forms negatively charged colloidal solution due to preferential adsorption of ${OH}^{-}$ ions

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