MCQs of Surface Chemistry

Showing 171 to 180 out of 203 Questions

171.

Dimensions of colloidal particles _____ .

(a)	is less than true solutions
(b)	is more than suspension
(c)	is between true solution and suspension
(d)	can be of any dimension

172.

Sodium stearate micelle has _____ .

(a)	hydrophobic head and hydrophobic tail
(b)	hydrophobic head and hydrophilic tail
(c)	hydrophilic head and hydrophobic tail
(d)	hydrophilic head and hydrophilic tail

173.

Select the correct statement regarding formation of micelle ?

(a)	Micelle is formed only at concentration lower than CMC.
(b)	Association formed during micelle formation, the polar head remains outside towards surface.
(c)	In the association formed during micelle formation, the non-polar tail remains outside towards surface.
(d)	Micelle always contains less than 100 molecules.

174.

What is the type of the following reaction to get Au_(sol) ?

Reaction : $2 {AuCl}_{3} + 3 HCHO + 3 H_{2} O \to 2 {Au}_{(sol)} + 3 H \cdot COOH + 6 HCl$

175.

How does alum help in the purification of water ?

(a)	Silicone forms complex with clay particles.
(b)	Sulphate ions combine with impurities and remove them.
(c)	It dissolves mud ( clay particles ) in water.
(d)	Aluminum ions coagulates clay particles.

176.

Out of Na₂SO₄, CaCl₂, Al₂(SO₄)₃ and NH₄Cl, which electrolyte is the most effective for coagulation of Sb₂S₃ solution ?

177.

Which of the following does not display Tyndall effect ?

178.

Which of the following systems possesses homogeneous mixture ?

179.

Which of the following colloidal sol can be prepared by chemical oxidation method ?

180.

Which of the following has the lowest coagulation value of As₂S₃ ?

Showing 171 to 180 out of 203 Questions