List of top Chemistry Questions on Surface Chemistry

The critical micelle concentration (CMC) of a soap solution is \( 5 \times 10^{-4} \, \text{mol L}^{-1} \). Identify the correct statements about this solution.
[I.] The micelle is stable if the soap solution concentration is \( 10^{-7} \, \text{mol L}^{-1} \)
[II.] The micelle is stable if the soap solution concentration is higher than \( 5 \times 10^{-4} \, \text{mol L}^{-1} \)
[III.] Micelles are also known as associated colloids.
Match the following:
List-I (Sol)List-II (Method of preparation)
A) \( \text{As}_2\text{S}_3 \)I) Bredig's arc method
B) \( \text{Au} \)II) Oxidation
C) \( \text{S} \)III) Hydrolysis
D) \( \text{Fe(OH)}_3 \)IV) Double decomposition
The adsorption of a gas on a solid surface follows Freundlich adsorption isotherm. At \( T \)(K), the gas pressure is \( 2 \) atm. What is the value of \( \frac{x}{m} \)? (\( n = 2 \) and \( k \) = constant)
In a colloidal solution, both the dispersed phase and dispersion medium are in liquid phase. What is the type of colloid?
The adsorption of a gas on a solid surface follows Freundlich adsorption isotherm. At \( T \)(K), the gas pressure is \( 2 \) atm. What is the value of \( \frac{x}{m} \)? (\( n = 2 \) and \( k \) = constant)
In a colloidal solution, both the dispersed phase and dispersion medium are in liquid phase. What is the type of colloid?
In a Freundlich adsorption isotherm, if the slope is unity and k is 0.1, the extent of adsorption at 2 atm is (log 2 = 0.30)
Adsorption of a gas on solids follows the Freundlich adsorption isotherm. The graph drawn between log $\frac{x}{m}$ (on the y-axis) and log \( p \) (on the x-axis) is a straight line with a slope equal to 3 and an intercept equal to 0.30. What is the value of $\frac{x}{m}$ at a pressure of 2 atm?
(Given: log 2 = 0.3)

Match the following 

Identify the catalytic reaction in which both reactants are in different phases.
Identify the correct statements from the following (only one):
I) Sulphur sol is an example of multimolecular colloid.
II) Starch sol is an example of associated colloid.
III) Artificial rubber is an example of macromolecular colloid.
In each of four separate beakers (I, II, III, IV), X mL of 1M Fe$_2$O$_3$·xH$_2$O colloidal solution is present.
Equal volume and equal concentration of KCl, K$_4$[Fe(CN)$_6$], K$_3$PO$_4$ and K$_2$SO$_4$ was added into I, II, III and IV respectively.
The efficiency of precipitations in these beakers follows the order
Which one of the following is not the correct characteristic property of physical adsorption?
Identify the correct statements from the following:
I) In adsorption process, both enthalpy and entropy decrease.
II) In general, physisorption is an irreversible process.
III) The catalyst used in the decomposition of potassium chlorate is manganese dioxide.
Which of the following is an example of a positively charged sol?
At T(K), adsorption of a gas on surface of a solid follows Freundlich adsorption isotherm. A graph of \( \log \left( \frac{x}{m} \right) \) (on y-axis) and \( \log p \) (on x-axis) for this gas gave a straight line with slope = 2 and intercept = 1.5. What is the value of n ?
The coagulating power of electrolytes having ions Na$^+$, Al$^{3+}$ and Ba$^{2+}$ for As$_2$S$_3$ sol increases in the order
Which of the following is adsorbent?
Movement of colloidal particle after developing charge
What is the dispersed phase and dispersion medium of the following colloidal systems?
Match List - I with List -
Colloidal antimony Kalaazar
Identify the method of preparation of a colloidal sol from the following:
To form a complete monolayer of acetic acid on 1g of charcoal, 100 mL of 0.5M acetic acid was used. Some of the acetic acid remained unadsorbed. To neutralize the unadsorbed acetic acid, 40 mL of 1M NaOH solution was required. If each molecule of acetic acid occupies P x 10−23 m2 surface area on charcoal, the value of P is _____.
[Use given data: Surface area of charcoal = 1.5 x 102 m2g−1 ; Avogadro’s number (NA) = 6.0 x 1023 mol−1 ]
The critical temperature of A, B, C, D gases are 190 K, 630 K, 261 K, 400 K respectively. The quantity of gas adsorbed per gram of charcoal at same pressure is least for the gas
Gold sol is not a: