33 + Interview Questions in ADSORPTION-AND-COLLOIDAL-SYSTEM IN GENERAL AWARENESS Page 1 InterviewSolution

1.	Which of the following expressions describes Freundlich adsorption isotherm?A. `log((x)/(m))=log k + (1)/(n)log p`B. `log((m)/(x))=log k + (1)/(n)log p`C. `log((x)/(m))=log p + (1)/(K)log p`D. `log((x)/(m))=log c + (1)/(n)log K`
Answer» Correct Answer - A

Discussion

2.	According to Freundlich adsorption isotherm, which of the following is correct?A. `(x)/(m)prop P^(@)`B. `(x)/(m)prop P^(1)`C. `(x)/(m)prop P^1//n`D. `All of the above are correct for different ranges of pressure
Answer» Correct Answer - D

Discussion

3.	Which one of the following substance is not a colloid?A. ChlorophyllB. SmokeC. Ruby glassD. Milk
Answer» Correct Answer - A Chlorophyll is not a colloid.

Discussion

4.	Which of the following is correct statement?A. Physisorption occurs at low temperature and chemisorption occurs at high temperatureB. Physisorption occurs at vary high temperature and chemisorption occurs at low temperatureC. Physisorption is irreversible and chemisorption is reversibleD. None of the above
Answer» Correct Answer - A At high temparature, kinetic energy of adsorbate increases and make a strong chemical bond between adsorbate and adsorbent, hence chemisoption occurs.

Discussion

5.	Adsorption is multilayer in case of :A. physical adsorptionB. chemisorptionC. Both (a) and (b)D. None of these
Answer» Correct Answer - A Adsorption is multilayered in case of physical adsorption while ti is almost monolayered in cass of chemical adsorption.

Discussion

6.	Which adsorption takes place at higher temperatures?A. physicalB. ChemicalC. Both (a) and (b)D. None of these
Answer» Correct Answer - B Chemical adsorption takes place at higher temperature, in comparison of physical adsorption.

Discussion

7.	Which of the following will be the most effective in the coagulation of `Fe(OH)_(3)` sol ?A. `Mg(PO_(4))_(2)`B. `BeCl_(2)`C. `NaCl`D. `KCN`
Answer» Correct Answer - A Accrding to Hardy Schulze rule, coagulation power of lons is directiy proportional to charge on ion. `:.Fe(OH)_(3)` is positively charged colloid. `:.` It will be coagulated anion. (a) `Mg_(3)(PO_(4))_(2)hArr 3Mg^(2+) + 2PO_(4)^(3-)` (b) `BaCl_(2)hArrBa^(2+) + 2Cl^(-)` (c ) `NaClhArr Na^(+) + Cl^(-)` (d)`KCN hArrK^(+) + CN^(-)`

Discussion

8.	Which of the following graphs represents freundlich adsorption isotherm?A. B. C. D.
Answer» Correct Answer - C In Freundlich isotherm

Discussion

9.	For Freundlich adsorption isotherm, `(x)/(m)=kp^1//n` , the value of n isA. awlays greater tham 1B. always smaller than 1C. always equal to 1D. greater than 1 at low temperature and smaller than 1 at high temperatute
Answer» Correct Answer - A `If n gt 1, then, (1)/(n) lt 1` `:.` n is always greater than 1.

Discussion

10.	"Rate of adsorption is directly proportional to the fraction of area uncovered and rate of desorption is directly proportion to the fraction of area covered". This statement is true forA. Freundlich adsorption isothermB. Langmuir adsorption isothermC. BET isothermD. None of the above
Answer» Correct Answer - A

Discussion

11.	Which requires catalyst ?A. `S + O_(2) rarr SO_(2)`B. `2SO_(2) + O_(2) rarr 2SO_(3)`C. `C + O_(2) rarr CO_(2)`D. All of the above
Answer» Correct Answer - B

Discussion

12.	Four different colloids have the following gold number, which one has most effective action?A. 10B. 30C. 20D. 40
Answer» Correct Answer - A Lesser the gold number , greater will be its protecting

Discussion

13.	Which property is not shown by colloids?A. AdsorptionB. Tyndall effectC. FlocculationD. Paramagnetism
Answer» Correct Answer - D Paramagnetism is not shown by colloids.

Discussion

14.	Following reaction is catalysed by `Br^(-)` `2H_(2)O_(2)(aq) rarr 2H_(2)O(/) + O_(2) (g)` This is an example ofA. homogeneous catalysisB. heterogenous catalysisC. Both (a) and (b)D. None of these
Answer» Correct Answer - A `2H_(2)O_(2)(aq)overset (Br^(-)(aq))rarr 2H_(2)O(/) + O_(2)(g)` This is an example of homogeneous catalysis.

Discussion

15.	The blue colour of the sky is due toA. scattering of light from the sunB. scattering of light from particles of dust in the atmosphereC. refraction of bule light by impurities in sea waterD. scattering of the light due to ozone layer
Answer» Correct Answer - B It is due to scattering of light from particles of dust in the atmosphere.

Discussion

16.	Gold number is the index forA. Protective power of lyophilic colloidB. purity of galdC. metallic goldD. electrplated gold
Answer» Correct Answer - A Protective character of various lyophilic substances is expressed in terms of gold number .

Discussion

17.	The enzyme that converts cane sugar into invert sugar (a mixture of glucose and fructose) isA. invertaseB. zymaseC. lactic bacilliD. diastase
Answer» Correct Answer - A

Discussion

18.	Which has the maximum coagulating pawer for ferric hydroxide colloid?A. `AlCl_(3)`B. `K_(4)[Fe(CN)_(6)]`C. `BeSO_(4)`D. `MgO`
Answer» Correct Answer - B Ferric hydroxide is a postitive sol, `[Fe(OH)_(3)]Fe^(3+)`. Hence, to coagulate it, an anion is needed .`K_(4)[Fe(CN)_(6)]` gives the tetravalent anion `[Fe(CN)_(6)]^(4-)` , hence it has the greatest coagulating power among these (Hardy-Schulze law).

Discussion

19.	Which of the following is not a colloid?A. MilkB. BloodC. LatexD. Vinegar
Answer» Correct Answer - D Vinegar is approximately 10% solution of acetic acid in water.

Discussion

20.	Gold soid and sulphur sols are the examples ofA. multimoleculer colloidsB. macromolecular colloidaC. associated colloidsD. All of the above
Answer» Correct Answer - A Gold sol and sulphur sol are the examples of multimolecular collcids.

Discussion

21.	The substance that adsorbed gets adsorbed on the surface of the soclid is calledA. adsorbateB. adsorbentC. micelleD. inner phase
Answer» Correct Answer - A

Discussion

22.	Adsorption is accompanied byA. decrease in entropyB. decrease in enthalpyC. decrease in free energyD. None of these
Answer» Correct Answer - D

Discussion

23.	Which of the following is not the true about the adsorption?A. During the process of adsorption, residual decreases forces decreasesB. During the adsorption surface energy decreasesC. It is an exothermic processD. It is a an endothermic process
Answer» Correct Answer - D

Discussion

24.	Amixture of sand and water is an example ofA. true solutionB. colloidal solutionC. suspensionD. All of the above
Answer» Correct Answer - C

Discussion

25.	Following is the variation of physical adsorption with temperature.A. B. C. D.
Answer» Correct Answer - B Adsorption of gases decreases with increase in temperature.

Discussion

26.	Which of the following statements are correct? I. Sillica gal adsords water the molecules. , II. Anhy. `CaCI_(2)` adsorbs the water molecules. , III. Adsorption is a surface phenomenon.A. I and IIB. II and IIIC. I and IIID. All of these
Answer» Correct Answer - B Anhy . `CaCl_(2)` adsorbs moisture and adsorption is a surface phenomenon.

Discussion

27.	Which to Kl soultion , positively charged sol particles of Agl are formed due to adsorption of ionA. `K^(+)`B. `Ag^(+)`C. `I^(-)`D. `NO_(3)^(-)`
Answer» Correct Answer - B Sol particles possess the tendency to adsorb preferentially the common ion present in solution.

Discussion

28.	Which of the following represents homogeneous catalysis?A. `Oil + H_(2)overset(Ni) rarr saturated fat`B. `N_(2) + 3H_(2)overset(Fe) rarr 2NH_(3)`C. `CH_(3)COOH + C_(2)H_(5)OH overset(H^(+)) rarr CH_(3)COOC_(2)H_(5) + H_(2)O`D. None of the above
Answer» Correct Answer - C

Discussion

29.	Which of the following indicates the charge on colloidal particles?A. Brownian movementB. ElectrophoresisC. ElectrolysisD. Tyndall effect
Answer» Correct Answer - B Electrophoresis shows that the colloidal particless have charge on them as they move towards oppositely charged electrode, when electric fiald is applied on them.

Discussion

30.	The gold number of a faw protective colloide are given `x = 0.005, y = 3.5, z = 40` The protective nature to these colloidal solutions follow the order:A. `z gt x gt y`B. `x lt y lt z `C. `z gt y gt x `D. `x gt y gt z`
Answer» Correct Answer - D Smaller the gold number is its protective power , Hence, the order would be `x gt y gt z` Gold number is used for calculating the protective powers of lyophilic colloids.

Discussion

31.	The path of a bean of light through smoke is visible becauseA. carbon dioxide in the smoke scatters lightB. carbon dioxide in the smoke absorbs lightC. carbon particles in the smoke absorb lightD. carbon partion in the smoke scatter light
Answer» Correct Answer - D

Discussion

32.	When a beam of light is passed through colloidal solution.A. it gets scatteredB. it geta adsorbedC. it is refractedD. it undergoes reflection
Answer» Correct Answer - A

Discussion

33.	Which of the following process will be observed, when a chalk stick is dipped in the solution of ink?A. AdsorptionB. AbsorptionC. DesorptionD. Both (a) and (b)
Answer» Correct Answer - D When a chalk stick is dipped in ink, the surface retains the colour of ink due to adsorption of coloured molecules while the solvent of the ink goes deeper into the stick due to absorption.

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following expressions describes Freundlich adsorption isotherm?A. `log((x)/(m))=log k + (1)/(n)log p`B. `log((m)/(x))=log k + (1)/(n)log p`C. `log((x)/(m))=log p + (1)/(K)log p`D. `log((x)/(m))=log c + (1)/(n)log K`

According to Freundlich adsorption isotherm, which of the following is correct?A. `(x)/(m)prop P^(@)`B. `(x)/(m)prop P^(1)`C. `(x)/(m)prop P^1//n`D. `All of the above are correct for different ranges of pressure

Which one of the following substance is not a colloid?A. ChlorophyllB. SmokeC. Ruby glassD. Milk

Adsorption is multilayer in case of :A. physical adsorptionB. chemisorptionC. Both (a) and (b)D. None of these

Which adsorption takes place at higher temperatures?A. physicalB. ChemicalC. Both (a) and (b)D. None of these

Which of the following will be the most effective in the coagulation of `Fe(OH)_(3)` sol ?A. `Mg(PO_(4))_(2)`B. `BeCl_(2)`C. `NaCl`D. `KCN`

Which of the following graphs represents freundlich adsorption isotherm?A. B. C. D.

For Freundlich adsorption isotherm, `(x)/(m)=kp^1//n` , the value of n isA. awlays greater tham 1B. always smaller than 1C. always equal to 1D. greater than 1 at low temperature and smaller than 1 at high temperatute

"Rate of adsorption is directly proportional to the fraction of area uncovered and rate of desorption is directly proportion to the fraction of area covered". This statement is true forA. Freundlich adsorption isothermB. Langmuir adsorption isothermC. BET isothermD. None of the above

Which requires catalyst ?A. `S + O_(2) rarr SO_(2)`B. `2SO_(2) + O_(2) rarr 2SO_(3)`C. `C + O_(2) rarr CO_(2)`D. All of the above

Four different colloids have the following gold number, which one has most effective action?A. 10B. 30C. 20D. 40

Which property is not shown by colloids?A. AdsorptionB. Tyndall effectC. FlocculationD. Paramagnetism

Following reaction is catalysed by `Br^(-)` `2H_(2)O_(2)(aq) rarr 2H_(2)O(/) + O_(2) (g)` This is an example ofA. homogeneous catalysisB. heterogenous catalysisC. Both (a) and (b)D. None of these

The blue colour of the sky is due toA. scattering of light from the sunB. scattering of light from particles of dust in the atmosphereC. refraction of bule light by impurities in sea waterD. scattering of the light due to ozone layer

Gold number is the index forA. Protective power of lyophilic colloidB. purity of galdC. metallic goldD. electrplated gold

The enzyme that converts cane sugar into invert sugar (a mixture of glucose and fructose) isA. invertaseB. zymaseC. lactic bacilliD. diastase

Which has the maximum coagulating pawer for ferric hydroxide colloid?A. `AlCl_(3)`B. `K_(4)[Fe(CN)_(6)]`C. `BeSO_(4)`D. `MgO`

Which of the following is not a colloid?A. MilkB. BloodC. LatexD. Vinegar

Gold soid and sulphur sols are the examples ofA. multimoleculer colloidsB. macromolecular colloidaC. associated colloidsD. All of the above

The substance that adsorbed gets adsorbed on the surface of the soclid is calledA. adsorbateB. adsorbentC. micelleD. inner phase

Adsorption is accompanied byA. decrease in entropyB. decrease in enthalpyC. decrease in free energyD. None of these

Which of the following is not the true about the adsorption?A. During the process of adsorption, residual decreases forces decreasesB. During the adsorption surface energy decreasesC. It is an exothermic processD. It is a an endothermic process

Amixture of sand and water is an example ofA. true solutionB. colloidal solutionC. suspensionD. All of the above

Following is the variation of physical adsorption with temperature.A. B. C. D.

Which of the following statements are correct? I. Sillica gal adsords water the molecules. , II. Anhy. `CaCI_(2)` adsorbs the water molecules. , III. Adsorption is a surface phenomenon.A. I and IIB. II and IIIC. I and IIID. All of these

Which to Kl soultion , positively charged sol particles of Agl are formed due to adsorption of ionA. `K^(+)`B. `Ag^(+)`C. `I^(-)`D. `NO_(3)^(-)`

Which of the following represents homogeneous catalysis?A. `Oil + H_(2)overset(Ni) rarr saturated fat`B. `N_(2) + 3H_(2)overset(Fe) rarr 2NH_(3)`C. `CH_(3)COOH + C_(2)H_(5)OH overset(H^(+)) rarr CH_(3)COOC_(2)H_(5) + H_(2)O`D. None of the above

Which of the following indicates the charge on colloidal particles?A. Brownian movementB. ElectrophoresisC. ElectrolysisD. Tyndall effect

The gold number of a faw protective colloide are given `x = 0.005, y = 3.5, z = 40` The protective nature to these colloidal solutions follow the order:A. `z gt x gt y`B. `x lt y lt z `C. `z gt y gt x `D. `x gt y gt z`

The path of a bean of light through smoke is visible becauseA. carbon dioxide in the smoke scatters lightB. carbon dioxide in the smoke absorbs lightC. carbon particles in the smoke absorb lightD. carbon partion in the smoke scatter light

When a beam of light is passed through colloidal solution.A. it gets scatteredB. it geta adsorbedC. it is refractedD. it undergoes reflection

Which of the following process will be observed, when a chalk stick is dipped in the solution of ink?A. AdsorptionB. AbsorptionC. DesorptionD. Both (a) and (b)