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Chemistry · 2022 · 3 marks
CBSE 2022 · Region 3 · Set 1 · Q7
(a) Differentiate between the following: (i) Adsorption and Absorption (ii) Lyophobic Sol and Lyophilic Sol (iii) Multimolecular Colloid and…
(a)
Differentiate between the following :
(i)
Adsorption and Absorption
(ii)
Lyophobic Sol and Lyophilic Sol
(iii)
Multimolecular Colloid and Macromolecular colloid.
OR
(b)(I)
Define the following terms :
(i)
Zeta Potential
(ii)
Coagulation
(II)
Why a negatively charged sol is obtained when $\displaystyle \mathrm{AgNO}_{3}$ solution is added to KI solution ?
Marking-scheme solution
(a) (i)
| Adsorption | Absorption |
| The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid. | The substance is uniformly distributed throughout the bulk of the solid. |
(ii)
| Lyophobic sol | Lyophilic sol |
| Solvent repelling | Solvent loving |
(iii)
| Multimolecular colloid | Macromolecular colloid |
| On dissolution, a large number of atoms or smaller molecules of a substance aggregate together to form species having size in the colloidal range. | When a colloid is formed by macromolecules in suitable solvents having size in the colloidal range. |
(b)
(i)
The potential difference between the fixed layer and the diffused layer of opposite charges is called zeta potential.
(ii)
The settling of colloidal particles / conversion of colloidal sol into precipitate.
(II)
Because of preferential adsorption of $\displaystyle \mathrm{I}^{-}$ ions on AgI colloid
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.