Which of the following process does not occur at the interface of phases?

At the equilibrium position in the process of adsorption ............ .

Which of the following interface cannot be obtained?

The term 'sorption' stands for ............ .

Extent of physisorption of a gas increases with .......... .

Extent of adsorption of absorbate from solution phase increases with ........... .

Which one of the following is not applicable to the phenomenon of adsorption?

Which of the following is not a favourable condition for physical adsorption?

Physical adsorption of a gaseous species may change to chemical adsorption with ........... .

In physisorption adsorbent does not show specificity for any particular gas because ........... .

Which of the following is an example of absorption?

On the basis of data given below predict which of the following gases shows least adsorption on a definite amount of charcoal?

In which of the following reactions heterogeneous catalysis is involved?

(i) $2 \mathrm{SO}_2(\mathrm{g})+\mathrm{O}_2(\mathrm{g}) \xrightarrow{\mathrm{NO}(\mathrm{g})} 2 \mathrm{SO}_3(\mathrm{g})$

(ii) $2 \mathrm{SO}_2(\mathrm{g}) \xrightarrow{\mathrm{Pt}(\mathrm{s})} 2 \mathrm{SO}_3(\mathrm{g})$

(iii) $\mathrm{N}_2(\mathrm{g})+3 \mathrm{H}_2(\mathrm{~g}) \xrightarrow{\mathrm{Fe}(\mathrm{s})} 2 \mathrm{NH}_3(\mathrm{g})$

(iv) $\mathrm{CH}_3 \mathrm{COOCH}_3(l)+\mathrm{H}_2 \mathrm{O}(l) \xrightarrow{\mathrm{HCl}(l)} \mathrm{CH}_3 \mathrm{COOH}(a q)+\mathrm{CH}_3 \mathrm{OH}(a q)$

At high concentration of soap in water, soap behaves as ......... .

Which of the following will show Tyndall effect?

Method by which lyophobic sol can be protected.

Freshly prepared precipitate sometimes gets converted to colloidal solution by ........... .

Which of the following electrolytes will have maximum coagulating value for $\mathrm{Ag} / \mathrm{Ag}^{+}$ sol?

A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as ............ .

The values of colligative properties of colloidal solution are of small order in comparison to those shown by true solutions of same concentration because of colloidal particles .............. .

Arrange the following diagrams in correct sequence of steps involved in the mechanism of catalysis, in accordance with modern adsorption theory.

Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?

Which of the following curves is in according with Freundlich adsorption isotherm?

Which of the following process is not responsible for the presence of electric charge on the sol particles?

Which of the following phenomenon is applicable to the process shown in the figure?

Assertion (A) An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles.

Reason (R) Pore size of the filter paper becomes more than the size of colloidal particle.

Assertion (A) Colloidal solution show colligative properties.

Reason (R) Colloidal particles are large in size.

Assertion (A) Colloidal solutions do not show Brownian motion.

Reason (R) Brownian motion is responsible for stability of sols.

Assertion (A) Coagulation power of $\mathrm{Al}^{3+}$ is more than $\mathrm{Na}^{+}$.

Reason (R) Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy-Schulze rule).

Assertion (A) Detergents with low CMC are more economical to use.

Reason (R) Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.

Which of the following options are correct?

Which of the following statements are correct about solid catalyst?

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?

$\mathbf{H}_{\mathbf{2}}$ gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to ............. .

Which of the following statements are correct?

An emulsion cannot be broken by ........... and ........... .

Which of the following substances will precipitate the negatively charged emulsions?

Which of the following colloids cannot be coagulated easily?

What happens when a Lyophilic sol is added to a Lyophobic sol?

Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?

In a reaction, catalyst changes ............ .

Which of the following phenomenon occurs when a chalk stick is dipped in ink?

Why is it important to have clean surface in surface studies?

Why is chemisorption referred to as activated adsorption?

What type of solutions are formed on dissolving different concentrations of soap in water?

What happens when gelatin is mixed with gold sol?

How does it become possible to cause artificial rain by spraying silver iodide on the clouds? Q. 43 Gelatin which is a peptide is added in ice-creams. What can be its role? Ans. Emulsifying agent is added to emulsion to stabilise the emulsion. Emulsifying agent form a layer between suspended particles and the medium and hence stabilises the emulsion. Ice cream (emulsion) is stabilised by emulsifying agent like gelatin. Q. 44 What is collodion? Ans. 4\% solution of nitrocellulose in a mixture of alcohol and ether is called collodion. Q. 45 Why do we add alum to purify water? Ans. We add alum to purify water as alum coagulates the colloidal impurities present in water, so that these impurities get settle down and remove by decantation or filtration. Thus, water gets purified by adding alum to water.

Gelatin which is a peptide is added in ice-creams. What can be its role?

What is collodion?

Why do we add alum to purify water?

What happens when electric field is applied to colloidal solution?

What causes Brownian motion in colloidal dispersion?

A colloid is formed by adding $\mathrm{FeCl}_3$ in excess of hot water. What will happen if excess sodium chloride is added to this colloid?

How do emulsifying agents stabilise the emulsion?

Why are some medicines more effective in the colloidal form?

Why does leather get hardened after tanning?

How does the precipitation of colloidal smoke take place in Cottrell precipitator?

How will you distinguish between dispersed phase and dispersion medium in an emulsion?

On the basis of Hardy-schulze rule explain why the coagulating power of phosphate is higher than chloride?

Why does bleeding stop by rubbing moist alum?

Why is $\mathrm{Fe}(\mathrm{OH})_3$ colloid positively charged, when prepared by adding $\mathrm{Fe}(\mathrm{OH})_3$ to hot water?

Why do physisorption and chemisorption behave differently with rise in temperature?

What happens when dialysis is prolonged?

Why does the white precipitate of silver halide become coloured in the presence of dye eosin?

What is the role of activated charcoal in gas mask used in coal mines?

How does a delta form at the meeting place of sea and river water?

Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.

Why is desorption important for a substance to act as good catalyst?

What is the role of diffusion in heterogeneous catalyst?

How does a solid catalyst enhance the rate of combination of gaseous molecules?

Do the vital functions of the body such as digestion get affected during fever? Explain your answer.

Method of formation of solution is given in Column I. Match it with the type of solution given in Column II.

Match the statement given in Column I with the phenomenon given in Column II.

Match the items given in Column I and Column II.

Match the types of colloidal systems given in Column I with the name given in Column II.

Match the items of Column I and Column II.

Match the items of Column I and Column II.

What is the role of adsorption in heterogeneous catalysis?

What are the applications of adsorption in chemical analysis?

What is the role of adsorption in froth floatation process used especially for concentration of sulphide ores?

What do you understand by shape selective catalysis? Why are zeolites good shape selective catalysts?