Surface Chemistry

The critical micelle concentration (CMC) of a soap solution is $5 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1}$. Identify the correct statements about this solution.
I. The micelle is stable if the soap solution concentration is $10^{-7} \...

Match the following

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Choose the incorrect statement from the following.

Which of the following statements regarding adsorption theory of heterogeneous catalysis is not correct ?

\(\text { Match the following }\)
$$ \begin{array}{llll} \hline & \begin{array}{l} \text { List-I } \\ \text { (Sol) } \end{array} & & \begin{array}{c} \text { List-II } \\ \text { (Method of preparation) } \end{array} \\ \hline \text { (...

Observe the following reactions
I. $\mathrm{N}_2(g)+3 \mathrm{H}_2(g) \xrightarrow[773 \mathrm{~K}, 200 \mathrm{~atm}]{x} 2 \mathrm{NH}_3(g)$
II. $\mathrm{CO}(\mathrm{g})+\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \xrightarrow[673 \mathrm{~K}]{Y} ...

In a Freundlich adsorption isotherm, if the slope is unity and $k$ is 0.1 , the extent of adsorption at 2 atm is ( $\log 2=0.30$ )

What is the indicator used in argentometric titrations?

The adsorption of a gas on a solid surface follows Freundlich adsorption isotherm.
At $T(\mathrm{~K})$, the gas pressure is 2 atm . What is the value of $\frac{x}{m} ?(n=2$ and $k=$ constant $)$

\(\text { Match the following }\)


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Adsorption of a gas on solids follows Freundlich adsorption isotherm. The graph drawn between $\log \frac{x}{m}$ (on $y$-axis) and $\log p$ (on $x$-axis) is a straight line with slope equal to 3 and intercept equal to 0.30 . What is the val...

Which one of the following is not the correct characteristic property of physical adsorption?

In each of four separate beakers (I, II, III, IV), $X \mathrm{~mL}$ of $y \mathrm{M} \mathrm{Fe}_2 \mathrm{O}_3 x \mathrm{H}_2 \mathrm{O}$ colloidal solution is present. Equal volume and equal concentration of KCl , $\mathrm{K}_4\left[\math...

The equation which represents Freundlich adsorption isotherm is ( $x=$ amount of gas, $m=$ mass of solid)

In a colloidal solution, both the dispersed phase and dispersion medium are in liquid phase. What is the type of colloid?

Identify the catalytic reaction in which both reactants are in different phases.

\(\text { Match the following }\)
$$ \begin{array}{clll} \hline & \text { List-I (Compound) } & & \text { List-II (Use) } \\ \hline \text { (A) } & \text { Kieselghur } & \text { (I) } & \text { Chromatographic material } \\ \hline \text ...

Consider the following.
Statement-I : Gold sol is prepared by Bredig's arc method.
Statement-II : Bredig's arc method involves only dispersion but not condensation.
The correct answer is

Identify the correct statement from the following
I. Sulphur sol is an example for multi molecular colloid.
II. Starch sol is an example for associated colloid.
III. Artificial rubber is an example for macromolecular colloid.

Two statements are given below
Statements I : Adsorption of a gas on the surface of charcoal is primarily an exothermic reaction.
Statement II : A closed vessel contains $\mathrm{O}_2, \mathrm{H}_2, \mathrm{Cl}_2$, $\mathrm{NH}_3$ gases. It...

The critical temperature of $A, B, C, D$ gases are 190 K , $630 \mathrm{~K}, 261 \mathrm{~K}, 400 \mathrm{~K}$ respectively. The quantity of gas adsorbed per gram of charcoal at same pressure is least for the gas

The following data is obtained for coagulating a positively charged sol in 2 hours


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' $A$ ' is a protecting colloid. The following data is obtained for preventing the coagulation of 10 mL of gold sol to which 1 mL of $10 \% \mathrm{NaCl}$ is added. What is the gold number of ' $A$ '?

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Which of the following is incorrectly matched?

The correct statement regarding chemisorption is

\(\text { Match List - I, with List-II. }\)
$$ \begin{array}{llll} \hline & \text { List I } & & \text { List II } \\ \hline \text { I } & \text { Colloidal antimony } & \text { A } & \text { Kalaazar } \\ \hline \text { II } & \text { Si...

Identify the method of preparation of a colloidal sol from the following.

' $X$ ' is a protecting colloid. The following data is obtained for preventing the coagulation of 10 mL of gold sol to which 1 mL of $10 \% \mathrm{NaCl}$ is added. What is the gold number of ' $X$ '?
$$ \begin{array}{ccl} \hline \text { Ex...

Which sol is used as intramuscular injection?

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Which of the following general reaction is an example for heterogeneous catalysis?

Which of the following has maximum coagulating power in the coagulation of positively charged sol?

The validity of Freundlich isotherm can be verified by plotting

Given below are two statements.Statements I Easily liqueflable gases are readily adsorbed.Statements II Adsorption enthalpy for physisorption is less compared to adsorption enthalpy for chemisorption.The correct answer is

Which of the following is not the application of adsorption?

The correct statements about zeolites are
They are good shape selective catalysts.
They contain Al-O-Si framework.
They are not found in nature.
They are used as catalysts for cracking hydrocarbons, in petrochemical industry.

The plot of $\log \frac{x}{m}$ ( $y$-axis) and $\log p$ ( $x$-axis) is a straight line inclined at an angle of $45^{\circ}$. When the intercept, $k$ is 10 and pressure is 0.3 atm the amount of solute in grams absorbed per gram of adsorbent ...

The most effective coagulating agent for antimony sulphide sol is

The correct order of coagulating power of the following ions to coagulate the positive sol is
\(\mathrm{\mathop {{{[Fe{{(CN)}_6}]}^{4 - }}}\limits_I ,\mathop {C{l^ - }}\limits_{II} ,\mathop {SO_4^{2 - }}\limits_{III}}\)

The diameters range of colloidal particles is approximately.

The macromolecular colloids of the following are
I. Starch solution
II. Sulphur sol
III. Synthetic detergent
IV. Synthetic rubber

Assertion (A) Animal skins are colloidal in nature.
Reason (R) Animal skin has positively charged particles.

In an adsorption experiment, a graph between \(\log (x / m)\) versus \(\log p\) was found to be linear with a slope of \(45^{\circ}\). The intercept on \(\log (x / m)\) axis was found to be 0.3010. The amount of gas adsorbed per gram of cha...

Which statements among the following are correct?
1. Freundlich isotherm fails at high pressure of the gas.
2. \(\Delta H < 0\) for both physical and chemical adsorption.
3. Physical adsorption in non-selective.
4. Chemical adsorption is re...

A plot of \(\log (x / m)\) versus \(\log (p)\) for adsorption of a gas on a solid gives a straight line with a slope of

The protective power of a lyophilic colloidal sol is expressed in terms of

Among the following, in which type of chromatography, both stationary and mobile phases are in liquid state?