1421 + Interview Questions in SURFACE-CHEMISTRY IN GENERAL AWARENESS Page 2 InterviewSolution

51.	In a colloidal state, the particle size of he dispersed phase ranges between `10^(3)` to `10^(6)` pm and the colloidal sol is of heterogeneous nature. Depending upon the ease with which these sols are formed, the colloidal sols are cassified as lyophilic and lyophobic. THe stability of a colloidal sol is due to the presence of charge on the sol particles and the neutralisation of the same is known as coagulation or precipitation. The coagulationg power of the active ions of he electrolytes can be compared with the help of Hardy-Schulze Law. The protecting power of the lyophilic sols can be compared with the help of gold number. Lesser the value of gold number, more will be the protecting power of the lyophilic sol. On adding feq drops of dilute HCl to freshly precipitated ferric hydroxide, a red coloured colloidal sol is obtained. The phenomenon is Known as:A. PeptisationB. DialysisC. Protective actionD. Dissolution.
Answer» Correct Answer - A Colloidal sol is formed by peptisation.

Discussion

52.	In a colloidal state, the particle size of he dispersed phase ranges between `10^(3)` to `10^(6)` pm and the colloidal sol is of heterogeneous nature. Depending upon the ease with which these sols are formed, the colloidal sols are cassified as lyophilic and lyophobic. THe stability of a colloidal sol is due to the presence of charge on the sol particles and the neutralisation of the same is known as coagulation or precipitation. The coagulationg power of the active ions of he electrolytes can be compared with the help of Hardy-Schulze Law. The protecting power of the lyophilic sols can be compared with the help of gold number. Lesser the value of gold number, more will be the protecting power of the lyophilic sol. Lyophilic sols are more stable than lyophobic sols becauseA. The colloidal particles have positive chargeB. The colloidal particles have no chargeC. The colloidal particles are solvatedD. There are strong electrostatic repulsions between the negatively charged colloidal particules.
Answer» Correct Answer - C is the correct answer.

Discussion

53.	In a colloidal state, the particle size of he dispersed phase ranges between `10^(3)` to `10^(6)` pm and the colloidal sol is of heterogeneous nature. Depending upon the ease with which these sols are formed, the colloidal sols are cassified as lyophilic and lyophobic. THe stability of a colloidal sol is due to the presence of charge on the sol particles and the neutralisation of the same is known as coagulation or precipitation. The coagulationg power of the active ions of he electrolytes can be compared with the help of Hardy-Schulze Law. The protecting power of the lyophilic sols can be compared with the help of gold number. Lesser the value of gold number, more will be the protecting power of the lyophilic sol. The areseneous sulphide sol has negative (-) charge. The maximum power to precipitate it is of :A. `H_(2)SO_(4)`B. `Na_(3)PO_(4)`C. `CaCl_(2)`D. `AlCl_(3).`
Answer» Correct Answer - D `Al^(3+)` ions have the maximum coagulating power according to Hardy-Schulze rule.

Discussion

54.	In a colloidal state, the particle size of he dispersed phase ranges between `10^(3)` to `10^(6)` pm and the colloidal sol is of heterogeneous nature. Depending upon the ease with which these sols are formed, the colloidal sols are cassified as lyophilic and lyophobic. THe stability of a colloidal sol is due to the presence of charge on the sol particles and the neutralisation of the same is known as coagulation or precipitation. The coagulationg power of the active ions of he electrolytes can be compared with the help of Hardy-Schulze Law. The protecting power of the lyophilic sols can be compared with the help of gold number. Lesser the value of gold number, more will be the protecting power of the lyophilic sol `[AgI]I^(-)` colloidal sol can be coagulated by the addition of a suitable action. 1 mol of `[AgI]I^(-)` required mole of `AgNO_(3), Pb (NO_(3))_(2)` and `Fe(NO_(3))_(3)` as:A. `1,1,1`B. `1,2,3`C. 1,1//2,1//3`D. `6,3,2`
Answer» Correct Answer - C The magnitude of + ve chargenon ions : `Ag^(+),Pb^(2+),Fe^(3+)` No. of moles required are : 1,1/2,1/3

Discussion

55.	In a colloidal state, the particle size of he dispersed phase ranges between `10^(3)` to `10^(6)` pm and the colloidal sol is of heterogeneous nature. Depending upon the ease with which these sols are formed, the colloidal sols are cassified as lyophilic and lyophobic. THe stability of a colloidal sol is due to the presence of charge on the sol particles and the neutralisation of the same is known as coagulation or precipitation. The coagulationg power of the active ions of he electrolytes can be compared with the help of Hardy-Schulze Law. The protecting power of the lyophilic sols can be compared with the help of gold number. Lesser the value of gold number, more will be the protecting power of the lyophilic sol. 0.025 g of starch sol is required to prevent the coagulatio of 10 mL of gold sol when 1 mL of `10%` NaCl solution is present. The gold number of strach sol is :A. 0.025B. `2.5xx10^(-5)`C. `0.25D. 25
Answer» Correct Answer - D No. of milligrams of starch required `0.025xx1000=25` mg. Gold no. of starch = 25.

Discussion

56.	How would you obtain a sol of `Agl`, the particles of which migrate toward cathode under the electric fieldA. By adding little excess of `Kl` to `AgNO_(3)` solutionB. By adding little excess of `AgNO_(3)` to `Kl` solutionC. By mixing equal volumes of `0.010M AgNO_(3)` and `0.010 MKl`D. Convection current
Answer» Correct Answer - 2 We want to prepare sol of `AgI` having positively charged particles, so a little excess of `Ag^(+)` should be added to `KI`.

Discussion

57.	Fixed parts of a colloidal solution of Agl are respectively` [Agl]l^(-) and [Agl] Ag^(+)` in presence ofA. Kl and `AgNO_(3)`B. `AgNO_(3)` and KlC. Kl and `KlO_(3)`D. `AgNO_(3) and Ba(NO_(3))_(2)`
Answer» Correct Answer - A

Discussion

58.	What do you understand by the term Adsorption.
Answer» Adsorption : The accumulation (or) concentration of a substance on the surface rather than in the bulk of solid (or) liquid is known as adsorption. Eg : Adsorption of gases like `O_(2), H_(2), Cl_(2)` etc., on charcoal.

Discussion

59.	A sol is prepared by addition of excess of `AgNO_(3)` solution in KI solution . The charge likely to develop on colloidal particles is :A. postiveB. negativeC. no chargeD. both charges
Answer» Correct Answer - a

Discussion

60.	Colloidal particles of soap sol in water isA. negatively chargedB. neutralC. Positively chargedD. Unpredictable
Answer» Correct Answer - A

Discussion

61.	Soaps essentially form a colloidal solution in water and remove the greasy matters by :A. adsorptionB. emulsificationC. coagulationD. absorption
Answer» Correct Answer - B

Discussion

62.	A soap solution in water removes greasy substances byA. adsorptionB. peptizationC. coagulationD. emulsifiction
Answer» Correct Answer - D

Discussion

63.	Soap essentially forms a colloidal solution in water and removes the greasy matter byA. AbsorptionB. EmulsificationC. CoagulationD. None of these
Answer» Correct Answer - B According to definition of emulsification.

Discussion

64.	When `KClO_(3)` is heated, it decomposes into `KCl+O_(2)`, if some `MnO_(2)` is added, the reaction goes much faster because.A. `MnO_(2)` decomposes to gives `O_(2)`B. `MnO_(2)` provides heat by reactingC. Better contact is provided by `MnO_(2)`D. `MnO_(2)` acts as a catalyst
Answer» Correct Answer - D `2KCIO_(3) overset(MnO_(2))(rarr) 2KCl+3O_(2)`.

Discussion

65.	Extent of adsorption of adsorbate from solution phase increases with …… .A. increase in amount of adsorbate in solutionB. decrease in surface area of adsorbentC. increase in temperature of solutionD. decrease in amount of adsorbate in solution.
Answer» Correct Answer - A

Discussion

66.	Which of the following statements are true for physisoption?A. Extent of adsortption increases with increase in pressure.B. It needs activation energy.C. It can be reversed easily.D. It occurs at high temperature.
Answer» Correct Answer - A::C

Discussion

67.	To coagulate gelatin sol, which of the following is most effective ?A. NaClB. `Na_(3)PO_(4)`C. `AlCl_(3)`D. Alcohol
Answer» Correct Answer - D

Discussion

68.	To coagulate gelatin sol, which of the following is most effective ?A. `NaCl`B. `Na_(3)PO_(4)`C. `AlCl_(3)`D. Alcohol
Answer» Correct Answer - D

Discussion

69.	Assertion :- Lyophilic sol coagulate by adding other solvent. Reason :- Lyophilic sol are stable due to hydration energy.A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.C. If Assertion is True but the Reason is False.D. If both Assertion & Reason are False.
Answer» Correct Answer - A

Discussion

70.	select correct absorption isobars for chemisoption and physisoption respectivly , (where `x/m ` = extent of adsorption , T = temperature )A. B. C. D.
Answer» Correct Answer - c

Discussion

71.	Assertion: Sky appears blue in colour. Reason: Colloidal particles od dust scatter blue light.A. if both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If the assertion and reason both are false.
Answer» Correct Answer - A The sky appears blue because the colloidal particles of dust, dirt in air scatter blue light to the maximum extent. Here both assertion and reason are correct and reason is the correct explanation of assertion.

Discussion

72.	the apparatus used to coagulate carbon particles from smoke is called ,A. cottrel smokerB. cottrell precipitatorC. cottell absorberD. none of these
Answer» Correct Answer - b

Discussion

73.	Sky appears blue in colour. Explain.
Answer» Dust particles along with water vapour suspended in air scatter blue light which reaches our eyes and hence the sky looks blue to us.

Discussion

74.	Which of the following ions has the least flocculating power?A. `Cl^(-)`B. `SO_(4)^(2-)`C. `PO_(4)^(3-)`D. `[F(CN)_(6)]^(4-)`
Answer» Correct Answer - A Generally, the greater the valence of the flocculating ion added, the greater is its power to cause precipitation. This is known as Hardy-Schulze rule. In the coagulation of a negative sol, the flocculating power is in the order: `Al^(3+)gtBa^(2+)gtNa^(+)` . Similarly, in the coagulation of a positive sol, the flocculating power is in the order: `[Fe(CN)_(6)]^(4-)gtPO_(4)^(3-)gtSO_(4)^(2-)gtCl^(-)`

Discussion

75.	The pressure of colloidal particles of dust in air imparts blue colour to the sky. This is due toA. absorption of light by dust particlesB. reflection of light by dust particlesC. scattering of light by dust particlesD. pesence of clouds
Answer» Correct Answer - c

Discussion

76.	What are micelles ? Give one example.
Answer» Micelles : Some substances which at low concentrations behave as normal strong electrolytes, but at high concentrations exhibit colloidal behaviour due to formation of aggregates. The aggregated particles thus formed are called micelles. Eg : Stearate ions `(C_(17)H_(33)COO^(-))` associate together in high concentration , in a solution of soap in water and forms a micelle.

Discussion

77.	Peptization is reverse of coagulation.
Answer» Correct Answer - T

Discussion

78.	When `6xx10^(-5)g` of a protective colloid was added to `20mL` of a standard gold sol, the precipitation of latter was just prevented on addition of `2mL` of `10%NaCl` solution. The gold number of a protective colloid isA. 3B. `3xx10^(-5)`C. 0.06D. 0.03
Answer» Gold number `=(6.0xx10^(-5)xx10^(3)(mg)xx10)/(20)=0.03` Gold number `=(6.0xx10^(-5)xx10^(3)(mg)xx10)/(20)=0.03`

Discussion

79.	The colloidal solution of gelatin in known as :A. Solvent loving solB. Reversible solC. Hydrophilic colloidsD. All of these
Answer» Correct Answer - D

Discussion

80.	When a hydrophilic sol like gelatin is subjected to electric field, the sol particle movesA. Towards anode when `pH gt` isoelectric pointB. In both directions at isoelectric pHC. Towards cathode when `pH lt` isoelectric pointD. All of these
Answer» Correct Answer - A::C

Discussion

81.	Which of the following statements is (are) true ?A. The concentration of a homogeneous catalyst may appear in the rate expression.B. A catalyst is always consumed in the reaction.C. A catalyst must always be in the same phase as the reactants.D. None of these
Answer» Correct Answer - A Catalyst may appear in rate expression. But it is not consumed in the reaction.

Discussion

82.	Which of the following statements is correct ?A. The efficiency of a heterogeneous catalyst depends upon its surface area.B. Catalyst operates by providing alternate path for the reaction that involves a lower activation energy.C. Catalyst lowers the energy of activation of the forward direction without affecting the energy of activation of the backward direction.D. Catalyst does not effect the overall enthalpy change of the reaction.
Answer» Correct Answer - A::B::D Efficiency of a heterogeneous catalyst increases with its surface area. Catalyst provides a path of lower activation energy but enthalpy of reaction is not effected.

Discussion

83.	Identify the correct statement regarding enzymes.A. Enzymes are specific biological catalysts that can normally function at very high tempt. `(T ~~ 1000 K)`B. Enzymes are normally heterogeneous catalysts that are very specific in actionC. Enzymes are specific biological catalysts that can not be poisonedD. Enzymes are non-biological catalysts.
Answer» Correct Answer - B Enzymes are highly specific heterogeneous catalyst.

Discussion

84.	The separation of an emulsion into its constituent liquids is known asA. emulsificationB. protective of colloidC. coagulationD. demulsification
Answer» Correct Answer - D The separation of an emulsion into its constituents is called demulsification . Various methods of demulsification are freezing, boiling, centrifugation or chemical methods.

Discussion

85.	Identify the correct statement regarding enzymesA. Enzymes are specific biocatalysts that can normally function at a very low temperature (about 100 K)B. Enzymes are normally hetergeneous catalysts that are very specific in actionC. Enzymes are specific biological catalysts which cannot be poisonedD. c
Answer» Correct Answer - D is the correct answer.

Discussion

86.	Which of the following is not a correct match ?A. Butter -O/W type emulsionB. Vanishing cream -O/W type emulsionC. Milk -O/W type emulsionD. Cream-W/O type emulsion
Answer» Correct Answer - A Butter is an example of water in oil type emulsion.

Discussion

87.	What happens when lyophilic sol is added to a lyophobic sol?A. Lyophilic sol is protectedB. Lyophobic sol is protectedC. Both the sols are coagulatedD. Electrophoresis takes place
Answer» Correct Answer - B Lyophobic sol is protected since a film of lyophilic sol is formed over lyophobic sol.

Discussion

88.	What happens when a Lyophilic sol is added to a Lyophobic sol?A. Lyophobic sol is protectedB. Lyophilic sol is protectedC. Film of lyophilic sol is formed over lyophobic solD. Film of lyophobic sol is formed over lyophilic sol
Answer» Correct Answer - A::C Lyophobic sol is unstable in nature when lyophilic sol is added to lyophobic sol then lyophobic sol is protected because a film of lyophilic sol is formed over lyophobic sol. Hence, (a) and (c) are correct.

Discussion

89.	What happens when lyophilic sol is added to a lyophobic sol?A. A film of lyophilic sol is formed over lyophobic sol and lyophobic sol is stabilized.B. Lyophobic sol gets coagulated.C. Lyophilic sol gets coagulated.D. Lyophilic sol gets protected by the lyophobic sol.
Answer» Correct Answer - A

Discussion

90.	A colloid is formed by adding `FeCl_(3)` in excess of hot water. What will happen if excess sodium chloride is added to this colloid?
Answer» Positively charged ions coagulate the negatively charged sol and negatively charged ion coagulate the positively charged sol. Positively charged sol of hydrated ferric oxide is formed when `FeCl_(3)` is added in excess of hot water. On adding excess of NaCl to this sol, negatively charged `Cl^(-)` ions coagulate the positively charged sol of hydrated ferric oxide.

Discussion

91.	Pumice stone and foam rubber are examples ofA. gelsB. emulsionsC. solid foamsD. liquid foams
Answer» Correct Answer - C They are gases dispersed in solids sometimes called solid sols

Discussion

92.	What happens when a Lyophilic sol is added to a Lyophobic sol?A. Lyophobic sol is protected.B. Loyophilic sol is protected.C. Lyophobic sol is formed over lyophilic sol.D. Film of lyophobic sol is formed over lyophilic sol.
Answer» Correct Answer - A::C Both these observations are correct.

Discussion

93.	Match the items of Column I and Column II. `{:("Column I","Column II"),("A. Butter ","1. Dispersion of liquid in liquid "),("B. Pumice stone ","2. Dispersion of solid in liquid"),("C. Milk","3. Dispersion of gas in solid"),("D. Paints","4. Dispersion of liquid in solid"):}`
Answer» Correct Answer - `A. to (4)` `B. to (3)` `C. to (1)` `D. to (2)` A. Butter is an example of dispersion of liquid in solid. B. Pumice stone is an example of dispersion of gas in solid in which gas bubbles are pearced within solid particles. C. Milk is a dispersion of liquid in liquid in which fats and protein are dissolved in milk. D. Paint is an example of solid in liquid.

Discussion

94.	Match the items given in Column I and Column II. `{:(,"Column I","Column II"),(A.,"Protective colloid",1.FeCl_(3)+NaOH),(B.,"Liquid-liquid colloid",2."Lyophilic colloids"),(C.,"Positively charged colloid",3."Emulsion"),(D.,"Negatively charged colloid",4.FeCl_(3)+"hot water"):}`
Answer» Correct Answer - `A. to (2)` `B. to (3)` `C. to (4)` `D. to (1)` A. Lyophobic colloid (solvent hating colloid) are readily protected by small amount of electrolyte . These colloids are also stabilised by addition of lyophilic colloids which makes a protective layer around lyophobic sol. Hence, lyophilic sol are known as protective colloid. B. Liquid-liquid colloid is also known as emulsion if they are partially miscible or immiscible liquids. (C) When `FeCl_(3)` is added to hot water it lead to the formation of positively charged colloid. (D) When `NaOH` is added to `FeCl_(3)` it lead to the formation of negatively charged colloid.

Discussion

95.	Assertion : Colloidal solutions are electrically netural Reason : Dispersed phase and dispersion medium carry same change.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason both are incorrect.
Answer» Correct Answer - C Correct reason. Dispersed phase and dispersion medium carry opposite charges.

Discussion

96.	`underset("Sucrose)(C_(12)H_(22)O_(11))+H_(2)O overset(di l. H_(2)SO_(4))(rarr) underset(Fruct ose)(C_(6)H_(12)O_(6)(aq))+underset(Glucose)(C_(6)H_(12)O_(6)(aq))` In this reaction, dilute `H_(2)SO_(4)` is calledA. homegeneous catalystB. Homogenous catalysisC. heterogeneous catalysisD. heterogeneous catalyst
Answer» Correct Answer - B Because reactant and catalyst are present in same physical state.

Discussion

97.	The degree of protection of a lyophobic colloid by the addition of a lyophilic colloid is measured in terms of :A. Gold numberB. Coagulation valueC. SedimentationD. None of these
Answer» Correct Answer - A Gold number is the amount of lyophilic in mg which just protect 10 mL gold sol against coagulation by 1 mL of 10% NaCl solution. It is a measure of protectivey power of lyophilic colloid.

Discussion

98.	Zeolites are :-A. Water softenerB. CatalystC. Both a and bD. None of these
Answer» Correct Answer - C Zeolites are used to make soft water from hard water as well as catalyst in petrochemical industry due to their shape selective natrue or activity because of different pore sizes and cavity sizes on their surface.

Discussion

99.	`underset("Sucrose")(C_(12)H_(22)O_(11))+H_(2)Ooverset(dil." "H_(2)SO_(4))tounderset("Fructose")(C_(6)H_(12)O_(6)(aq))+underset("Glucose")(C_(6)H_(12)O_(6)(aq))` in this reaction, dilute `H_(2)SO_(4)` is called.A. Homogenous catalysisB. Homogenous catalystC. Heterogenous catalysisD. Heterogenous catalyst
Answer» Correct Answer - B Because reactant and catalyst are present in same physical state.

Discussion

100.	Which of the following is true about catalystA. It initiates reactionB. It changes equilibrium pointC. It increase average kinetic energyD. It accelerates the rate of reaction.
Answer» Correct Answer - D Catalyst is a substance which changes the rate of reaction without affecting the overall energetics of the reaction.

Discussion

Explore topic-wise InterviewSolutions in .

Fixed parts of a colloidal solution of Agl are respectively` [Agl]l^(-) and [Agl] Ag^(+)` in presence ofA. Kl and `AgNO_(3)`B. `AgNO_(3)` and KlC. Kl and `KlO_(3)`D. `AgNO_(3) and Ba(NO_(3))_(2)`

What do you understand by the term Adsorption.

A sol is prepared by addition of excess of `AgNO_(3)` solution in KI solution . The charge likely to develop on colloidal particles is :A. postiveB. negativeC. no chargeD. both charges

Colloidal particles of soap sol in water isA. negatively chargedB. neutralC. Positively chargedD. Unpredictable

Soaps essentially form a colloidal solution in water and remove the greasy matters by :A. adsorptionB. emulsificationC. coagulationD. absorption

A soap solution in water removes greasy substances byA. adsorptionB. peptizationC. coagulationD. emulsifiction

Soap essentially forms a colloidal solution in water and removes the greasy matter byA. AbsorptionB. EmulsificationC. CoagulationD. None of these

When `KClO_(3)` is heated, it decomposes into `KCl+O_(2)`, if some `MnO_(2)` is added, the reaction goes much faster because.A. `MnO_(2)` decomposes to gives `O_(2)`B. `MnO_(2)` provides heat by reactingC. Better contact is provided by `MnO_(2)`D. `MnO_(2)` acts as a catalyst

Extent of adsorption of adsorbate from solution phase increases with …… .A. increase in amount of adsorbate in solutionB. decrease in surface area of adsorbentC. increase in temperature of solutionD. decrease in amount of adsorbate in solution.

Which of the following statements are true for physisoption?A. Extent of adsortption increases with increase in pressure.B. It needs activation energy.C. It can be reversed easily.D. It occurs at high temperature.

To coagulate gelatin sol, which of the following is most effective ?A. NaClB. `Na_(3)PO_(4)`C. `AlCl_(3)`D. Alcohol

To coagulate gelatin sol, which of the following is most effective ?A. `NaCl`B. `Na_(3)PO_(4)`C. `AlCl_(3)`D. Alcohol

select correct absorption isobars for chemisoption and physisoption respectivly , (where `x/m ` = extent of adsorption , T = temperature )A. B. C. D.

the apparatus used to coagulate carbon particles from smoke is called ,A. cottrel smokerB. cottrell precipitatorC. cottell absorberD. none of these

Sky appears blue in colour. Explain.

Which of the following ions has the least flocculating power?A. `Cl^(-)`B. `SO_(4)^(2-)`C. `PO_(4)^(3-)`D. `[F(CN)_(6)]^(4-)`

The pressure of colloidal particles of dust in air imparts blue colour to the sky. This is due toA. absorption of light by dust particlesB. reflection of light by dust particlesC. scattering of light by dust particlesD. pesence of clouds

What are micelles ? Give one example.

Peptization is reverse of coagulation.

When `6xx10^(-5)g` of a protective colloid was added to `20mL` of a standard gold sol, the precipitation of latter was just prevented on addition of `2mL` of `10%NaCl` solution. The gold number of a protective colloid isA. 3B. `3xx10^(-5)`C. 0.06D. 0.03

The colloidal solution of gelatin in known as :A. Solvent loving solB. Reversible solC. Hydrophilic colloidsD. All of these

When a hydrophilic sol like gelatin is subjected to electric field, the sol particle movesA. Towards anode when `pH gt` isoelectric pointB. In both directions at isoelectric pHC. Towards cathode when `pH lt` isoelectric pointD. All of these

Which of the following statements is (are) true ?A. The concentration of a homogeneous catalyst may appear in the rate expression.B. A catalyst is always consumed in the reaction.C. A catalyst must always be in the same phase as the reactants.D. None of these

The separation of an emulsion into its constituent liquids is known asA. emulsificationB. protective of colloidC. coagulationD. demulsification

Which of the following is not a correct match ?A. Butter -O/W type emulsionB. Vanishing cream -O/W type emulsionC. Milk -O/W type emulsionD. Cream-W/O type emulsion

What happens when lyophilic sol is added to a lyophobic sol?A. Lyophilic sol is protectedB. Lyophobic sol is protectedC. Both the sols are coagulatedD. Electrophoresis takes place

What happens when a Lyophilic sol is added to a Lyophobic sol?A. Lyophobic sol is protectedB. Lyophilic sol is protectedC. Film of lyophilic sol is formed over lyophobic solD. Film of lyophobic sol is formed over lyophilic sol

What happens when lyophilic sol is added to a lyophobic sol?A. A film of lyophilic sol is formed over lyophobic sol and lyophobic sol is stabilized.B. Lyophobic sol gets coagulated.C. Lyophilic sol gets coagulated.D. Lyophilic sol gets protected by the lyophobic sol.

A colloid is formed by adding `FeCl_(3)` in excess of hot water. What will happen if excess sodium chloride is added to this colloid?

Pumice stone and foam rubber are examples ofA. gelsB. emulsionsC. solid foamsD. liquid foams

What happens when a Lyophilic sol is added to a Lyophobic sol?A. Lyophobic sol is protected.B. Loyophilic sol is protected.C. Lyophobic sol is formed over lyophilic sol.D. Film of lyophobic sol is formed over lyophilic sol.

Match the items of Column I and Column II. `{:("Column I","Column II"),("A. Butter ","1. Dispersion of liquid in liquid "),("B. Pumice stone ","2. Dispersion of solid in liquid"),("C. Milk","3. Dispersion of gas in solid"),("D. Paints","4. Dispersion of liquid in solid"):}`

Match the items given in Column I and Column II. `{:(,"Column I","Column II"),(A.,"Protective colloid",1.FeCl_(3)+NaOH),(B.,"Liquid-liquid colloid",2."Lyophilic colloids"),(C.,"Positively charged colloid",3."Emulsion"),(D.,"Negatively charged colloid",4.FeCl_(3)+"hot water"):}`

The degree of protection of a lyophobic colloid by the addition of a lyophilic colloid is measured in terms of :A. Gold numberB. Coagulation valueC. SedimentationD. None of these

Zeolites are :-A. Water softenerB. CatalystC. Both a and bD. None of these

Which of the following is true about catalystA. It initiates reactionB. It changes equilibrium pointC. It increase average kinetic energyD. It accelerates the rate of reaction.