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How many of the following statements about adsorption are CORRECT? (i) During adsorption, there is always a decrease in residual forces of the surface. (ii) During adsorption, surface energy decreases; this energy appears as heat, making adsorption exothermic. (iii) Physisorption can be multilayered. (iv) Precipitate of Mg(OH)2 attains a blue color in the presence of magneson dye due to adsorption of magneson. (v) A mixture of noble gases can be separated by adsorption on coconut charcoal at different temperatures.

1. 3
2. 4
3. 5
4. 2

Correct answer: 5

Solution

All five statements are correct. Adsorption reduces surface residual forces (i), releases energy as heat (ii), physisorption is multilayered unlike chemisorption (iii), magneson is an adsorption indicator for Mg²+ (iv), and coconut charcoal separates noble gases by selective adsorption at different temperatures (v).

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