Chapter 11

Which is not correct regarding the adsorption of a gas on surface of solid? (a) on increasing temperature adsorption increases continuously (b) enthalpy and entropy change is \(-\) ve (c) adsorption is more for some specific substance (d) reversible

Position of non-polar and polar part in micelles: (a) polar on outer surface and non polar on inner surface (b) polar on inner surface and non polar on outer surface (c) distributed over all the surface (d) are present on the surface only

Which of the following forms cationic micelles above certain concentration? (a) sodium dodecyl sulphate (b) sodium acetate (c) urea (d) cetyltrimethyl ammonium bromide

The statement not applicable to chemisoption is that it is (a) highly specific (b) independent of temperature (c) irreversible (d) slow

The blue colour of water in the sea is due to (a) scattering of blue light by water molecules (b) reflection of blue sky by sea water (c) refraction of blue light by the impurities in sea water (d) adsorption of other colours, except the blue colour by water molecules

Which of the following is correct for lyophilic sol? (a) irreversible sol (b) formed from inorganic substances (c) readily coagulated by addition of electrolyte (d) self stabilized

Rate of physisorption increases with (a) decrease in temperature (b) increase in temperature (c) decrease in pressure (d) decrease in surface area

Milk is a colloid in which (a) liquid is dispersed in liquid (b) gas is dispersed in liquid (c) sugar is dispersed in water (d) solid is dispersed in liquid

Physical adsorption is inversely proportional to (a) temperature (b) volume (c) concentration (d) all of these

The migration of colloidal particle under the influence of electric field towards an electrode is known as (a) electrophoresis (b) electro-osmosis (c) Tyndall effect (d) Brownian movement

Butter is a colloidal solution of (a) solid solid (b) liquid solid (c) solid-liquid (d) gas-solid

How many layers are adsorbed in chemical adsorption? (a) zero (b) one (c) two (d) infinite

In the adsorption of oxalic acid on activated charcoal, the activated charcoal is known as (a) adsorber (b) adsorbent (c) absorber (d) adsorbate

Adsorbed acetic acid on activated charcoal is (a) adsorbate (b) adsorber (c) absorber (d) absorbent

Which one of the following forms micelles in aqueous solution above certain concentration? (a) dodecyl trimethyl ammonium chloride (b) glucose (c) urea (d) pyridinium chloride

What is the name of a phenomenon in which both adsorption and absorption takes place? (a) chemisorption (b) physisorption (c) desorption (d) sorption

What is the equation form of Langmuir isotherm under high pressure? (a) \(\mathrm{x} / \mathrm{m}=\mathrm{a} / \mathrm{b}\) (b) \(\mathrm{x} / \mathrm{m}=\mathrm{a} . \mathrm{p}\) (c) \(\mathrm{x} / \mathrm{m}=1 / \mathrm{a}\).p (d) \(\mathrm{x} / \mathrm{m}=\mathrm{b} / \mathrm{a}\)

Which one of the following statements is not correct? (a) physical adsorption decreases with increase in the temperature (b) physical adsorption is multilayered (c) activation energy of physical adsorption is very high. (d) enthalpy change of physical adsorption is about \(20 \mathrm{kI} \mathrm{mol}^{-1}\)

Which one of the following is an example of adsorption? (a) ammonia in contact with water (b) anhydrous \(\mathrm{CaCl}_{2}\) with water (c) silica gel in contact with water vapours (d) all of these.

Colloidal solution of gold prepared by different methods are of different colours because of (a) variable valency of gold (b) different concentrations of gold particles (c) impurities produced by different methods (d) different diameters of colloidal gold particle

The extent of adsorption of a gas on a solid depends upon (a) nature of gas (b) temperature of gas (c) pressure of gas (d) all of these

Which of the following statement is incorrect about lyophobic sols? (a) they commonly form gels (b) they undergo electrophoresis and electro-osmosis (c) they are not prepared by direct mixing (d) they exhibit the Tyndal effect

At \(15^{\circ} \mathrm{C}\), out of \(\mathrm{H}_{2}, \mathrm{CH}_{4}, \mathrm{CO}_{2}, \mathrm{NH}_{3}\), which gas will be adsorbed maximum by charcoal? (a) \(\mathrm{H}_{2}\) (b) \(\mathrm{CH}_{4}\) (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{NH}_{3}\)

Difference between crystalloids and colloids is of (a) solubility (b) reactivity (c) size of particles (d) none of these

Solid aerosol in an example of colloidal system of (a) liquid dispersed in gas (b) liquid dispersed in gas (c) solid dispersed in gas (d) solid dispersed in liquid

Which of the following colloids are solvent loving? (a) lyophilic (b) lyophobic (c) hydrophilic (d) none of these

Which of the following colloids are solvent hating? (a) lyophilic (b) lyophobic (c) hydrophilic (d) none of these

Shape selective catalysts are known by this name because (a) due of the shape of catalyst (b) The specificity of catalyst (c) The size of pores of the catalyst can trap only selective species (d) none of these

An example of an associated colloid is (a) vegetable oil (b) rubber latex (c) soap solution (d) milk

Colloidal solution of arsenious sulphide is prepared by (a) hydrolysis (b) double decomposition (c) electrodispersion method (d) peptization

Which of the following is the correct Freundlich's formula? (a) \(\mathrm{w} / \mathrm{m}=\mathrm{k} \mathrm{P}^{\mathrm{l} / \mathrm{n}}\) (b) \(\mathrm{w} / \mathrm{m}=\mathrm{kP}^{2 \mathrm{n}}\) (c) \(\mathrm{w} / \mathrm{m}=\mathrm{kP}^{\mathrm{n}}\) (d) \(\mathrm{m} / \mathrm{w}=\mathrm{kp}^{1 / \mathrm{n}}\)

If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as (a) foam (b) sol (c) emulsion (d) gel

The diameter of colloidal particle ranges from (a) \(10^{-9} \mathrm{~m}\) to \(10^{-6} \mathrm{~m}\) (b) \(10^{-6} \mathrm{~m}\) to \(10^{-3} \mathrm{~m}\) (c) \(10^{-12} \mathrm{~m}\) to \(10^{-9} \mathrm{~m}\) (d) \(10^{-3} \mathrm{~m}\) to \(10^{-6} \mathrm{~m}\)

A colloidal solution of a liquid, in a solid is termed as (a) aerosol (b) gel (c) emulsion (d) sol

Which of the following substance is not used in the preparation of lyophilic sol? (a) gum (b) gelatine (c) metal sulphide (d) starch

The process of separating a crystalloid, from a colloid by filtration, is called (a) emulsification (b) dialysis (c) coagulation (d) peptization

The separation of colloidal particles from those of molecular dimensions is called (a) dialysis (b) photolysis (c) peptization (d) pyrolysis

Dialysis can separate which of the following in addition to the glucose from the human blood? (a) fructose (b) starch (c) proteins (d) sucrose

The simplest way, to check whether a system is colloidal or not is by (a) Tyndall effect (b) electrodialysis (c) finding out particle size (d) Brownian movement

If a beam of light is passed through a true solution, then it (a) is not visible (b) is visible (c) will scatter (d) none of these

Which of the following is not related to colloids? (a) ultrafiltration (b) dialysis (c) Brownian movement (d) wavelength

Artificial rain is caused by spraying (a) neutral charged colloidal dust over a cloud (b) same charged colloidal dust over a cloud (c) both (a) and (b) (d) opposite charged colloidal dust over a cloud

In Kjeldahl's method, \(\mathrm{CuSO}_{4}\) acts as (a) reducing agent (b) oxidizing agent (c) catalytic agent (d) hydrolyzing agent

The solution of rubber is an example of (a) lyophobic colloid (b) multimolecular colloid (c) associated colloid (d) macromolecular colloid

Smoke is a colloidal dispersion of a (a) solid in a gas (b) liquid in a gas (c) gas in a solid (d) gas in a gas

A colloidal solution of \(\mathrm{Fe}(\mathrm{OH})_{3}\) in water is called (a) emulsion (b) colloid (c) hydrophobic (d) hydrophilic

Which of the following type of molecules form micelles? (a) non-polar molecules (b) polar molecules (c) surfacant molecules (d) all of these

The Critical Micelle Concentration is the concentration at which (a) true solution is formed (b) micellization (c) one molar electrolyte is present per \(1000 \mathrm{~g}\) of solution (d) solute and solution form equilibrium

Colloidal solution of silver is prepared by (a) Bredig's arc method (b) peptization (c) colloidal milk (d) double decomposition method

When a few typical solutes are separated by a particular selective membrane, such as protein particles from blood corpuscles, the process is called (a) exosmosis (b) dialysis(c) transpiration (d) endosmosis