Surface Chemistry Test 4

Total Questions:50 Total Time: 75 Min



Questions 1 of 50

Question:When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid

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Remains unaffected

Decreases first then increases

Questions 2 of 50

Question:The charge on \(A{s_2}{S_3}\) sol is due to the adsorbed

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\({H^ + }\)

\(O{H^ - }\)

\({O^{2 - }}\)

\({S^{2 - }}\)

Questions 3 of 50

Question:In chemical adsorption, how many layers are adsorbed

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Questions 4 of 50

Question:The colloidal system consisting of a liquid adsorbent in a solid adsorbate is termed as

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Questions 5 of 50

Question:Noble gases are adsorbed by

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Anhydrous calcium chloride

Ferric hydroxide

Conc. \({H_2}S{O_4}\)

Activated coconut charcol

Questions 6 of 50

Question:The equation for Freundlich adsorption isotherm is

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\(\frac{x}{m} = k{p^{1/n}}\)

\(x = mk{p^{1/n}}\)

\(x/m = k{p^{ - n}}\)

All of these

Questions 7 of 50

Question:Enzymes with two sites are called

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Allosteric enzyme

Conjugate enzyme

Questions 8 of 50

Question:In a reversible reaction, a catalyst will affect the rate of

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Forward reaction

Reverse reaction

Forward and reverse reaction

Neither nor

Questions 9 of 50

Question:Which of the following statements is true for a catalyst

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It increases the energy of the reactants

It decreases the energy of the products

It decreases the energy of the reactants

It does not change the enthalpy of the reactants

Questions 10 of 50

Question:Which one of the following changes when catalyst is used in a reaction

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Heat of reaction

Product of reaction

Equilibrium constant

Activation energy

Questions 11 of 50

Question:Enzymes are

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Inorganic compounds


Questions 12 of 50

Question:A catalyst is a substance which

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Increases the rate of a reaction

Increases the amount of the products formed in a reaction

Decreases the temperature required for the reaction

Alters the speed of the reaction remaining unchanged chemically at the end of the reaction

Questions 13 of 50

Question:In a homogeneous catalysis

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The catalyst and the reactants should be gases

The catalyst and the reactants should form a single phase

Catalyst and the reactants are all solids

The catalyst and the reactions are all liquids

Questions 14 of 50

Question:Which requires catalyst

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\(S + {O_2} \to S{O_2}\)

\(2S{O_2} + {O_2} \to 2S{O_3}\)

\(C + {O_2} \to C{O_2}\)


Questions 15 of 50

Question:Gold number is

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The number of mg of lyophilic colloid which should be added to 10 ml of ferric hydroxide sol so as to prevent its coagulation by the addition of 1 ml of 10% sodium chloride solution

The number of mg of lyophilic colloid which should be added to 10 ml of standard gold sol so as to prevent its coagulation by the addition of 1 ml of 10% \(NaCl\)

The mg of gold salt to be added to a lyophilic colloid to coagulate it

The mg of an electrolyte required to coagulate a colloid

Questions 16 of 50

Question:Starch dispersed in hot water is an example of

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Hydrophobic sol

Lyophilic sol

Associated colloid

Questions 17 of 50

Question:Gold number is associated with

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Only lyophobic colloids

Only lyophilic colloids

Both lyophobic and lyophilic colloids

None of these

Questions 18 of 50

Question:The purification of the colloidal particles from crystalloid dimensions through semipermeable membrane is known as

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Questions 19 of 50

Question:In emulsions, the dispersion medium and dispersed phase are

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Both solids

Both gases

Both liquids

One is solid and other is liquid

Questions 20 of 50

Question:Which one of the following is not a colloidal solution

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Questions 21 of 50

Question:Which is a natural colloidal

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Sodium chloride




Questions 22 of 50

Question:Brownian motion is due to

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Temperature fluctuation within the liquid phase

Attraction and repulsion between charge on the colloidal

Impact of molecules of the dispersion medium on the colloidal particles

Convective currents

Questions 23 of 50

Question:Milk can be preserved by adding a few drops of

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Formic acid solution

Formaldehyde solution

Acetic acid solution

Acetaldehyde solution

Questions 24 of 50

Question:Lyophobic colloids are

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Reversible colloids

Irreversible colloids

Protective colloids

Gum proteins

Questions 25 of 50

Question:Which of the following pairs of ions would be expected to form precipitate when their dilute solution are mixed

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\(N{a^ + },\,SO_3^{2 - }\)

\(NH_4^ + ,\,CO_3^{2 - }\)

\(N{a^ + },\,{S^{ - 2}}\)

\(F{e^{ + 3}},\,PO_4^{ - 3}\)

Questions 26 of 50

Question:Jelly is a form of

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Colloidal solution

Supersaturated solution

True solution

Questions 27 of 50

Question:The reason for the stability of a lyophobic sol is

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Brownian movement

Tyndall effect

Electric charge

Brownian movement and electric charge

Questions 28 of 50

Question:Which one can act as semipermeable membrane

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Phenol layer



All of these

Questions 29 of 50

Question:In which particles can pass through semipermeable membrane

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Molecules of solvent

Complex ions

Simple ions

Molecules of solute

Questions 30 of 50

Question:When excess of electrolyte is added to a colloid it

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Gets diluted

Does not change

Questions 31 of 50

Question:Different colloidal particles of gold having different colours, obtained from different methods due to

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Variable valency of gold

Different concentration of gold particles

Different types of impurities

Different radius of colloidal particles

Questions 32 of 50

Question:Which one of the following is lyophilic colloid

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Questions 33 of 50

Question:Which of the following represents surfactant molecule

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\({C_{17}}{H_{25}}CO{O^ - }N{a^ + }\)


None of these

Questions 34 of 50

Question:Emulsifiers are generally

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Synthetic detergents

Lyophilic sols

All of these

Questions 35 of 50

Question:In shaving cream, the dispersion medium is

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None of these

Questions 36 of 50

Question:The example of heteropolar sol is

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Starch sol in water

Rubber sol in water

Protein sol in water

Sulphur sol

Questions 37 of 50

Question:Milk is an example of

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Pure solution




Questions 38 of 50

Question:Dialysis is the process of separation of

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Suspended particles from colloids

Suspended particles from crystalloids

Colloidal particles from crystalloids

Colloidal particles from gel

Questions 39 of 50

Question:At the critical micelle concentration, the surfactant molecules

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Become completely soluble

Questions 40 of 50

Question:The decomposition of \({H_2}{O_2}\) can be slowed down by the addition of small amount of phosphoric acid which act as

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Questions 41 of 50

Question:A detergent is a

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Cleaning agent




Questions 42 of 50

Question:Blood may be purified by

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Questions 43 of 50

Question:The stability of lyophilic colloidal sol is due to

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Both charge and salvation

Only salvation

Only charge

None of these

Questions 44 of 50

Question:Which of the following statement is false

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Every solid substance can be brought into colloidal state

Colloidal particles carry electrical charges

Every solid substance can be made to behave like a lyophilic colloid

Addition of electrolytes causes flocculation of colloidal particles

Questions 45 of 50

Question:A colloidal system in which gas bubbles are dispersed in a liquid is known as

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Questions 46 of 50

Question:On adding few drops of dilute \(HCl\) or \(FeC{l_3}\) to freshly precipitated ferric hydroxide a red coloured colloidal solution is obtained. The phenomenon is known as

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Protective action


Questions 47 of 50

Question:Which of the following can act as protective colloids

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Hydrophobic sols

Hydrophilic sol

Gold sol

None of these

Questions 48 of 50

Question:A catalyst is a substance which

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Is always in the same phase as in the reactions

Alters the equilibrium in a reaction

Does not participate in the reaction but alters the rate of reaction

Participates in the reaction and provide an easier pathway for the same

Questions 49 of 50

Question:Cod liver oil is

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An emulsion


Colloidal solution


Questions 50 of 50

Question:An aerosol is a

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Dispersion of a solid or liquid in a gas

Dispersion of a solid in a liquid

Dispersion of a liquid in a liquid

Solid solution