28
MCQ (Multiple Correct Answer)
Freundlich adsorption isotherm is given by the expression $\frac{x}{m}=\mathrm{kp}^\frac{1}{n}$ Which of the following conclusions can be drawn from this expression?
A
When $\frac{1}{n}=0$, the adsorption is independent of pressure
B
When $\frac{1}{n}=0$, the adsorption is directly proportional to pressure
C
When $n=0, \frac{x}{m}$ vs $p$ graph is a line parallel to $x$-axis
D
When $n=0$, plot of $\frac{X}{m}$ vs $p$ is a curve
29
MCQ (Multiple Correct Answer)
$\mathbf{H}_{\mathbf{2}}$ gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to ............. .
A
very strong van der Waals' interaction
B
very weak van der Waals' forces
C
very low critical temperature
D
very high critical temperature
30
MCQ (Multiple Correct Answer)
Which of the following statements are correct?
A
Mixing two oppositely charged sols neutralises their charges and stabilises the colloid
B
Presence of equal and similar charges on colloidal particles provides stability to the colloids
C
Any amount of dispersed liquid can be added to emulsion without destabilising it
D
Brownian movement stabilises sols
31
MCQ (Multiple Correct Answer)
An emulsion cannot be broken by ........... and ........... .
A
heating
B
adding more amount of dispersion medium
C
freezing
D
adding emulsifying agent
32
MCQ (Multiple Correct Answer)
Which of the following substances will precipitate the negatively charged emulsions?
A
KCl
B
Glucose
C
Urea
D
NaCl