Q11 of 81 Page 63

Which of the following is an example of absorption?

Silica gel, finely divided nickel and metal surface all have a porous structure which makes them good adsorbent. Thus they facilitate the adsorption process.

Therefore, (i), (iii) and (iv) are wrong options.


Calcium chloride is a strong hygroscopic substance which absorbs moisture readily. Thus, water is easily absorbed by CaCl2 making it good absorbent.


Therefore, (ii) is correct.

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Physical adsorption of a gaseous species may change to chemical adsorption with ______________.

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In physisorption adsorbent does not show specificity for any particular gas because ______________.

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On the basis of data given below predict which of the following gases shows least adsorption on a definite amount of charcoal?

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In which of the following reactions heterogenous catalysis is involved?

(a) 2SO2 (g) + O2 (g) 2SO3 (g)


(b) 2SO2 (g) 2SO3 (g)


(c) N2 (g) + 3H2 (g) 2NH3 (g)


(d) CH3COOCH3 (l) + H2O (l) CH3COOH (aq) + CH3OH (aq)