Surface Chemistry PYQ - Physical Chemistry (AP EAPCET)

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

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

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

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 reversible, whereas physical adsorption is irreversible.

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 charcoal under a pressure of \(0.5 \mathrm{~atm}\) is

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.

The diameters range of colloidal particles is approximately.

The correct order of coagulating power of the following ions to coagulate the positive sol is

$$\mathrm{\mathop {{{[Fe{{(CN)}_6}]}^{4 - }}}\limits_I ,\mathop {C{l^ - }}\limits_{II} ,\mathop {SO_4^{2 - }}\limits_{III}}$$

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

' $X$ ' 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 ' $X$ '?

$$\begin{array}{ccl} \hline \text { Expt No. } & \begin{array}{c} \text { Weight of } X \text { (in mg) } \\ \text { added to gold sol } \end{array} & \text { Coagulation } \\ \hline 1 & 24 & \text { Not prevented } \\ \hline 2 & 23 & \text { Not prevented } \\ \hline 3 & 26 & \text { Prevented } \\ \hline 4 & 27 & \text { Prevented } \\ \hline 5 & 25 & \text { Prevented } \\ \hline \end{array}$$

$$\text { Match List - I, with List-II. }$$

$$\begin{array}{llll} \hline & \text { List I } & & \text { List II } \\ \hline \text { I } & \text { Colloidal antimony } & \text { A } & \text { Kalaazar } \\ \hline \text { II } & \text { Silver sol } & \text { B } & \text { Intermuscular injection } \\ \hline \text { III } & \text { Milk of magnesia } & \text { C } & \text { Eye lotion } \\ \hline \text { IV } & \text { Gold sol } & \text { D } & \text { Stomach disorder } \\ \hline \end{array}$$