Chapter 11

Match the following Column-I (a) Sulphur vapour passed through cold water (b) Soap mixed with water above critical micelle concentration (c) White of egg whipped with water (d) Soap mixed with water below critical micelle concentration Column-II (p) Normal electrolyte solution (q) Molecular colloids (r) Associated colloid (s) Macro molecular colloids

Match the followling Column-I (a) Dispersion medium moves in an electric field (b) Solvent molecules pass through semipermeable membrane towards soolvent side (c) Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes. (d) Solvent molecules pass through semi permeable membranes towards solution side Column-II (p) Osmosis (q) Electrophoresis (r) Electroosmosis (s) Reverse Osmosis

Match the following \begin{tabular}{l} Column-I (a) Protective colloid (b) Liquid - liquid colloid (c) Positively charged colloid (d) Negatively charged colloid Column-II (p) \(\mathrm{FeCl}_{3}+\mathrm{NaOH}\) (q) Lyophilic colloids (r) Emulsion (s) \(\mathrm{FeCl}_{3}\) hot water

Match the following Column-I (a) Solid in liquid (b) Liquid in solid (c) Liquid in Liquid (d) Gas in liquid Column-II (p) Foam (q) Sol (r) Gel (s) Emulsion

Match the following Column-I (a) Butter (b) Pumice stone (c) Milk (d) Paints Column-II (p) Dispersion of liquid in liquid (q) Dispersion of solid in liquid (r) Dispersion of gas in solid (s) Dispersion of liquid in solid

Assertion: When freshly precipitated nickel sulphide (NiS) is shaken with a solution of hydrogen sulphide, a colloidal solution is obtained. Reason: A colloidal solution is stable because all the colloidal particles carry same charge

Assertion: Finely divided solid reactants react much faster as compared to massive reactants. Reason: Finely divided solid reactants possess a large surface area.

Assertion: When \(\mathrm{AgNO}_{3}\) is treated with excess of potassium iodide, colloidal particles gets attracted towards anode. Reason: Colloidal particles adsorb common ions and thus become charged.

Assertion: Colloidal solutions show colligative properties Reason: Colloidal particles are large in size

Assertion: Colloidal solutions do not show Brownian motion. Reason: Brownian motion is responsible for stability of sols.

Assertion: Coagulation power of \(\mathrm{Al}^{3}\) is more than Na. Reason: Greater the valency of the flocculating ion added greater is its power incause precipitation (Hardy Schulze rule).

Assertion: Detergents with low CMC are more economical to use Reason: Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.

In Germiniliti \(\left[\mathrm{Na}_{\mathrm{x}} \mathrm{Ca}\left(\mathrm{AlO}_{2}\right)_{2}\left(\mathrm{SiO}_{2}\right)_{4} 6 \mathrm{H}_{2} \mathrm{O}\right]\) The value of ' \(\mathrm{x}^{\prime}\) is?

How many of these metals are usally used as catalysts \(\mathrm{Pd}, \mathrm{Pt}, \mathrm{Ni}, \mathrm{Na} / \operatorname{liq} \cdot \mathrm{NH}_{3}\)

Alum is widely used to purify water since (a) it forms complex with clay particles (b) it coagulates the mud particles (c) it exchanges \(\mathrm{Ca}^{2+}\) and \(\mathrm{Mg}^{2+}\) ions present in hard water (d) its sulphate ion is water purifier

Which of the following characteristics is not correct for physical adsorption? (a) adsorption on solids is reversible (b) adsorption is spontaneous (c) both enthalpy and entropy of adsorption are negative (d) adsorption increases with increase in temperature

Identify the correct statement regarding enzymes. [2004] (a) Enzymes are specific biological catalysts that cannot be poisoned (b) Enzymes are specific biological catalysts that possess well defined active sites (c) Enzymes are specific biological catalysts than can normally function at very high temperatures \((1000 \mathrm{~K})\) (d) Enzymes are normally heterogeneous

Which of the following is adsorbed in maximum amount by activated charcoal? (a) \(\mathrm{N}_{2}\) (b) \(\mathrm{CO}\) (c) \(\mathrm{NHCl}\) (d) \(\mathrm{CO}_{2}\)

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. which of the following statements is incorrect? (a) magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol (b) sodium sulphate solution causes coagulation in both sols (c) mixing of the sols has no effect (d) coagulation in both sols can be brought about by electrophoresis

In Langmuir's model of adsorption of a gas on a solid surface (a) the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered (b) the adsorption at a single site on the surface may involve multiple molecules at the same time (c) the mass of gas striking a given area of surface is proportional to the pressure of the gas (d) the mass of gas striking a given area of surface is independent of the pressure of the gas

Gold numbers of protective colloids \(\mathrm{A}, \mathrm{B}, \mathrm{C}\) and \(\mathrm{D}\) are \(0.50,0.01,0.10\) and \(0.005\), respectively. The correct order of their protective powers is [2008] (a) \(\mathrm{D}<\mathrm{A}<\mathrm{C}<\mathrm{B}\) (b) \(C

Which of the following statement is incorrect regarding physissorptions? [2009] (a) More easily liquefiable gases are adsorbed readily. (b) Under high pressure it results into multi molecular layer on adsorbent surface. (c) Enthalpy of adsorption \(\left(\Delta \mathrm{H}_{\text {adsorption }}\right)\) is low and positive (d) It occurs because of van der Waal's forces.

According to Freundlich adsorption isotherm, which of the following is correct? [2012] (a) \(\frac{\mathrm{x}}{\mathrm{m}} \propto \mathrm{P}^{\mathrm{l} / \mathrm{n}}\) (b) \(\frac{x}{m} \propto P^{1}\) (c) \(\frac{x}{m} \propto P^{0}\) (d) All the above are correct for different ranges of pressure

The coagulating power of electrolytes having ions \(\mathrm{Na}^{+}, \mathrm{Al}^{3+}\) and \(\mathrm{Ba}^{2+}\) for arsenic sulphide sol increases in the order: (a) \(\mathrm{Ba}^{2+} \mathrm{Na}^{+}<\mathrm{Al}^{3+}\) (b) \(\mathrm{Al}^{3+}<\mathrm{Na}^{+} \mathrm{Ba}^{2+}\) (c) \(\mathrm{Al}^{3+}<\mathrm{Ba}^{2+}<\mathrm{Na}^{+}\) (d) \(\mathrm{Na}^{+}<\mathrm{Ba}^{2+}<\mathrm{Al}^{3}\)

\(3 \mathrm{~g}\) of activated charcoal was added to \(50 \mathrm{~mL}\) of acetic acid solution \((0.06 \mathrm{~N})\) in a flask. After an hou it was filtered and the strength of the filtrate was found to be \(0.042 \mathrm{~N}\). The amount of acetic acid adsorbed (per gram of charcoal) is [2015] (a) \(18 \mathrm{mg}\) (b) \(36 \mathrm{mg}\) (c) \(42 \mathrm{mg}\) (d) \(54 \mathrm{mg}\)

Match the catalysts to the correct processe Catalyst a. \(\mathrm{TiCl}_{3}\) b. \(\mathrm{PdCl}_{2}\) c. \(\mathrm{CuCl}_{2}\) d. \(\mathrm{V}_{2} \mathrm{O}_{5}\) Process (i) Wacker process (ii) Ziegler-Natta polymerization (iii) Contact process (iv) Deacon's process (a) a (iii), b (ii), c (iv), d (i) (b) a (ii), b (i), c (iv), d (iii) (c) a (ii), b (iii), c (iv), d (i) (d) a (iii), b (i), c (ii), d (iv)

The main oxides formed on comustion of Li, Na and \(\mathrm{K}\) in excess of air are, respectively: (a) \(\mathrm{LiO}_{2}, \mathrm{Na}_{2} \mathrm{O}_{2}\) and \(\mathrm{K}_{2} \mathrm{O}\) (b) \(\mathrm{Li}_{2} \mathrm{O}_{2}, \mathrm{Na}_{2} \mathrm{O}_{2}\) and \(\mathrm{KO}_{2}\) (c) \(\mathrm{Li}_{2} \mathrm{O}, \mathrm{Na}_{2} \mathrm{O}_{2}\) and \(\mathrm{KO}_{2}\) (d) \(\mathrm{Li}_{2} \mathrm{O}, \mathrm{Na}_{2} \mathrm{O}\) and \(\mathrm{KO}_{2}\)