This chapter is currently out of syllabus
1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following statements is NOT correct?
A
magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol.
B
sodium sulphate solution causes coagulation in both sols
C
mixing the sols has no effect
D
coagulation in both sols can be brought about by electrophoresis
2
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Which one of the following characteristics is not correct for physical adsorption?
A
Adsorption increases with increase in temperature
B
Adsorption is spontaneous
C
Both enthalpy and entropy of adsorption are negative
D
Adsorption on solids is reversible
3
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The formation of gas at the surface of tungsten due to adsorption is the reaction of order :
A
0
B
1
C
2
D
insufficient data
4
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Alum helps in purifying water by :
A
forming Si complex with clay particles
B
sulphate part which combines with the dirt and removes it
C
coagulating the mud particles
D
making mud water soluble
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