The disperse phase, dispersion medium and nature of colloidal sol

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Which of the following is an example for heterogeneous catalysis reaction ?

  • 2SO2(g) + O2(g) NO(g) 2SO3 (g)

  • Hydrolysis of aqueous sucrose solution in the presence of aqueous mineral acid

  • 2H2O2 (l) Pt(s) 2H2O (l) + O2 (g)

  • Hydrolysis of liquid in the presence of aqueous mineral acid


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52.

The disperse phase, dispersion medium and nature of colloidal solution (lyophilic or lyophobic) of 'gold sol' respectively are :

  • solid, solid, lyophobic

  • liquid, liquid, lyophobic

  • solid, liquid, lyophobic

  • solid, liquid, lyophilic


C.

solid, liquid, lyophobic

The disperse phase, dispersion medium and nature of colloidal solution of 'gold sol'  are solid, liquid and lyophobic respectively. 

Colloidal solution of gold is obtained when dispersed phase is solid and dispersion medium is liquid. Substances like metals cannot be brought into the colloidal state simply by bringing them in contact with water and therefore, special methods are devised for the purpose. Hence, they are known as hydrophobic or lyophobic colloids.


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53.

Assertion (A) : A catalyst increases the rate of a reaction.

Reason (R) : In presence of a catalyst, the activation energy of the reaction increases.

The correct answer is

  • Both (A) and (R) are true and (R) is the correct explanation of (A).

  • Both (A) and (R) are true but (R) is not the correct explanation of (A).

  • (A) is true, but (R) is not true

  • (A) is not true, but (R) is true


54.

Which one of the following graphs represents Freundlich adsorption isotherm ?


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55.

Which of the following is not correct?

  • Milk is a naturally occurring emulsion

  • Gold sol is a lyophilic sol

  • Physical adsorption decreases with rise in temperature

  • Chemical adsorption is unilayered


56.

Which one of the following gives a straight line for Freundlich adsorption isotherm?

  • log xm vs log p

  • xm vs 1p

  • log xm vs log 1p

  • xm vsp


57.

Match the following:
List - I List - II
A. Solid dispersed in liquid i. Emulsion
B. Liquid dispersed in liquid ii. Foam
C. Gas dispersed in liquid iii. Gel
D. Liquid dispersed in solid

iv. Sol

v. Aerosol

The correct match is

  • A - iv; B - i; C - ii; D - iii

  • A - iii; B - i; C - v; D - ii

  • A - iii; B - i; C - ii; D - iv

  • A - iv; B - i; C - v; D - iii


58.

Gelly is a colloidal solution of

  • solid in liquid

  • liquid in solid

  • liquid in liquid

  • solid in solid


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59.

Which of the following is the most effective in causing coagulation of ferric hydroxide solution?

  • KCl

  • KNO3

  • K2SO4

  • K3[Fe(CN)6]


60.

Which of the following statements is not correct inrespect of chemisorption?

  • Highly specific adsorption

  • Irreversible adsorption

  • Multilayered adsorption

  • High enthalpy of adsorption


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