26
MCQ (Multiple Correct Answer)
Which of the following options are correct?
A
Micelle formation by soap in aqueous solution is possible at all temperatures
B
Micelle formation by soap in aqueous solution occurs above a particular concentration
C
On dilution of soap solution micelles may revert to individual ions
D
Soap solution behaves as a normal strong electrolyte at all concentrations
27
MCQ (Multiple Correct Answer)
Which of the following statements are correct about solid catalyst?
A
Same reactants may give different products by using different catalysts
B
Catalyst does not change $\Delta H$ of reaction
C
Catalyst is required in large quantities to catalyse reactions
D
Catalytic activity of a solid catalyst does not depend upon the strength of chemisorption
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