JEE Main · 2022 · 27 Jun 2022 · Shift 1 · Surface Chemistry

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Match List-I with List-II

List-I:
(A) Lyophilic colloid
(B) Emulsion
(C) Positively charged colloid
(D) Negatively charged colloid

List-II:
(I) Liquid-liquid colloid
(II) protective colloid
(III)

FeCl_{3} + NaOH

(IV)

FeCl_{3} +

hot water

Choose the correct answer from the options given below:

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

Answer: (A)

Solution

Matching colloidal systems:

Lyophilic colloids act as protective colloids (stabilize other colloids)
Emulsions are liquid-in-liquid colloidal systems
$FeCl_{3} +$ hot water forms positively charged hydrated ferric oxide colloid
$FeCl_{3} + NaOH$ forms negatively charged colloid due to preferential adsorption of $OH^{-}$ ions

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

JEE Main · 2022 · 27 Jun 2022 · Shift 1 · Single correct option

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JEE Main · 2022 · 27 Jun 2022 · Shift 1 · Surface Chemistry

Solution

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