Q. The formation of micelles takes place only above
✅ Correct Answer: (D)
Kraft temperature
Surface Chemistry MCQs with answers
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Q. Colloidion is 4% solution of which one of the following in alcohol-ether mixture.
✅ Correct Answer: (A)
Nitrocellulose
Q. A plot of log xm vs log p for adsorption of gas on a solid gives in straight line with slope equal to
✅ Correct Answer: (B)
1n
Q. The protective power of lyophilic colloidal sol is expressed in terms of
✅ Correct Answer: (C)
gold number
Q. The coagulation values in millimoles per litre of the electrolyte for the coagulation of As2S3 sol are given
I. NaCl (52)
II. BaCl2 (0.69)
III. MgSO4 (0.22)
The correct order of coagulating power is
I. NaCl (52)
II. BaCl2 (0.69)
III. MgSO4 (0.22)
The correct order of coagulating power is
✅ Correct Answer: (C)
III > II > I
Q. According to Freundlich adsorption isotherm, which of the following is correct?
✅ Correct Answer: (D)
All are correct of different ranges of pressure
Q. 3g of activated charcoal was added to 50 ml of acetic acid solution (0.06 M) in a flask. After an hour it was filtered and the strength of filtrate was found to be 0.042 M. The amount of acetic acid adsorbed per gram of charcoal is
✅ Correct Answer: (B)
54 mg
Q. During the adsorption of gas on the surface of solid, which of the following is true?
✅ Correct Answer: (C)
∆G < 0, ∆H < 0, ∆S < 0
Q. The best coagulant for the precipitation of Fe(OH)3 sol is
✅ Correct Answer: (C)
Na3PO4
Q. The stability of lyophobic sols is due to
✅ Correct Answer: (C)
the charge on particles
Q. Gold sol can be prepared by
✅ Correct Answer: (D)
Reduction of AUCl3 with HCHO solution.
Q. The term ‘sorption’ stands for ___________ .
✅ Correct Answer: (D)
both absorption and adsorption
Q. Extent of adsorption of adsorbate from solution phase increases with ___________ .
✅ Correct Answer: (A)
increase in amount of adsorbate in solution.
Q. Physical adsorption of a gaseous species may change to chemical adsorption with ___________ .
✅ Correct Answer: (D)
increase in temperature
Q. On the basis of data given below predict which of the following gases shows least adsorption on a definite amount of charcoal?
✅ Correct Answer: (B)
SO2
Q. In which of the following reactions heter-ogenous catalysis is involved?
✅ Correct Answer: (A)
(ii), (iii)
Q. In Freundlich adsorption isotherm x/m = Kp1/n, the value of ‘n’ at low pressure is
✅ Correct Answer: (B)
equal to one
Q. According to adsorption theory of catalysis, the speed of the reaction increases because
✅ Correct Answer: (D)
adsorption lowers the activation energy of the reaction.
Q. Which shape selective catalyst is used to convert alcohol to gasoline?
✅ Correct Answer: (C)
ZSM-5
Q. When a small amount of FeCl3 is added to a freshly precipitated Fe(OH)3, b reddish brown colloidal solution is obtained. This pheno¬menon is known as
✅ Correct Answer: (B)
protection
Q. Lyophillic colloids are stable due to
✅ Correct Answer: (D)
layer of dispersion of medium on the particles.
Q. Cottrell precipitator is used to
✅ Correct Answer: (B)
precipitate carbon particles from smoke.
Q. The potential difference between the fixed charged layer and the diffused layer having opposite charge is called
✅ Correct Answer: (A)
Zeta potential
Q. Peptization is a process of
✅ Correct Answer: (C)
dispersing precipitate into colloidal solution.
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