UNIT 10: Surface Chemistry - Online Test
Q1. For Freundlich isotherm a graph of log (x/m) is plotted against log p. The slope of the line and its y – axis intercept respectively corresponds to
Answer : Option C
Explaination / Solution:
x/m =k.p1/n
log(x/m )=logk+ 1/ n logp
y=c+mx
m = 1/n and c= logk
Q2. Which of the following is incorrect for physisorption?
Answer : Option B
Explaination / Solution:
The incorrect statement is option
(b)
Physisorption is an exothermic
process. Hence increase in temperature decreases the physisorption.
Q3. Which one of the following characteristics are associated with adsorption?
Answer : Option D
Explaination / Solution:
Adsorption leads to decrease in
randomness (entropy).i.e. ∆S< 0 for the adsorption to occur, ∆G should be
-ve. We know that ∆G=∆H-T∆S if ∆S is -ve, T∆S is +ve. It means that ∆G will
become negative only when ∆H is -ve and ∆H>T∆S
Q4. Fog is colloidal solution of
Answer : Option C
Explaination / Solution:
dispersion
medium-gas dispersed phase-liquid
Q5.
Assertion : Coagulation power of Al3+ is more than Na+
.
Answer : Option A
Explaination / Solution:
(Hardy-Schulze rule)
Q6. Statement : To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?
Answer : Option B
Explaination / Solution:
No Explaination.
Q7. Hair cream is
Answer : Option B
Explaination / Solution:
Emulsion dispersed phase
Q8. Which one of the following is correctly matched?
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. The
most effective electrolyte for the coagulation of As2 S3Sol
is
Answer : Option D
Explaination / Solution:
As2S3
is a -vely charged colloid. It will be
most effectively coagulated by the cation
with greater valency. i.e., Al3+ .
Q10. Which one of the is not a surfactant?
Answer : Option B
Explaination / Solution:
No Explaination.
