Q14 of 37 Page 1

Write one difference in each of the following :

(i) Lyophobic sol and Lyophilic sol


(ii) Solution and Colloid


(iii) homogeneous catalysis and Heterogeneous catalysis

(i) lyophilic sols are directly formed by mixing substances like gum, gelatine etc with a suitable liquid (the dispersion medium) . these are liquid loving. Whereas substances like metals, their sulphides, etc., when simply mixed with the dispersion medium do not form the colloidal sol are called lyophobic sols. These are liquid hating.


(ii) The important difference between a solution and a colloid is that of particle size. In a solution, the constituent particles are ions or small molecules whereas in a colloid, the dispersed phase may consist of particles of a single macromolecule or an aggregate of many atoms, ions or molecules.


(iii) In homogeneous catalysis, the catalyst is in the same phase as that of reactants, whereas in heterogeneous catalysis the catalyst is in a different phase from that of the reactants.


More from this chapter

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12

A. Calculate the mass of Ag deposited at cathode when a current of 2 amperes was passed through a solution of AgNO3 for 15 minutes.

(Given Molar mass of Ag = 108g mol–1 1F = 96500 C mol–1)


B. Define fuel cell.

 13

(i) What type of isomerism is shown by the complex [Co(NH3)6][Cr(CN)6]?

(ii) Why a solution of [Ni(H2O)6]2+ is green while a solution of [Ni(CN)4]2– is colourless? (At. No. of Ni = 28)


(iii) Write the IUPAC name of the following complex : [Co(NH3)5(CO3)]Cl.

 15

Following data are obtained for the reaction:

N2O5→ 2NO2 + 1/2 O2
















t/s



0



300



600



[N2O5]/mol L–1



1.6 × 10–2



0.8 × 10–2



0.4 × 10–2



A. Show that it follows first order reaction.


B. Calculate the half-life.


(Given log 2 = 0.3010 log 4 = 0.6021)

 16

Following compounds are given to you :

2-Bromopentane, 2-Bromo-2-methy-lbutane, 1-Bromopentane


(i) Write the compound which is most reactive towards reaction.


(ii) Write the compound which is optically active.


(iii) Write the compound which is most reactive towards β–elimination reaction.