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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Plot of log `x//m` against log `p` is a straigh line inclined at an angle of `46^(@)` . When the pressure is `0.5` atom and Freundlich parameter `k` is `10.0` , the amount of the solute adsorbed per gram of adsorbent will be `(log 5=0.6990)` :A. `2g`B. `1g`C. `5g`D. `3g` |
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Answer» Correct Answer - C According to Freundlich adsorption isotherm `(x)/(m)=kp^(1//m)` or log `(x)/(m)=logk+(1)/(n)logP` Plot of log `x//m` vs log `P` is a straight line with slope `=1//m` and intercept `=logk`. Thus `(1)/(n)=tantheta=tan45^(@)=1` or `n=1` At `P=0.5` atm and `k=10` `(x)/(m)=(10)(0.5)^(1)=5` Thus, amount adsorbed per gram of adsorbent is `5g` |
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| 252. |
Plot of log against log P is a straight line inclined at an angle of `45^(@)`. When the pressure is 0.5 atm and Freundlich parameter ,K is 10, the amount of solute adsorbed per gram of adsorbent will be : (log 5=0.6990 )A. 1 gB. 2 gC. 3 gD. 5 g. |
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Answer» Correct Answer - D `x//m=KP^(1//n)=10.0(0.5)=5` If m = 1g , then x=5g(given `1//n = tan theta =tan 45^(@)`=1) |
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| 253. |
Plot of log `x/m` against log `p` is a straight line inclined at an angle of `45^(@)` . When the pressure is `0.5` atm and Freundlich parameter `k` is `10.0` , the amount of the solute adsorbed per gram of adsorbent will be `(log 5=0.6990)` :A. 1 gB. 2 gC. 3 gD. 5 g |
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Answer» Correct Answer - D Freundlich adsorption isotherm equation is `(x)/(m) = k_(p)^(1// n)` On taking log both sides `"log"(x)/(m) = log k + (1)/(n)` log p `"log"(x)/(m) = log 10 + 1* log 0.5` `"log" (x)/(m) = 1 + log (5 xx 10^(-1))` `"log" (x)/(m) = 1 + 0.6990^(-1)` = `0.6990` `(x)/(m) = 5.00 = 5 ` g |
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| 254. |
Graph between `log x//m` and `log p` is a straight line inclined at an angle of `45^@` . When pressure is `0.5 atm` and `1n k = 0.693`, the amount of solute adsorbed per gram of adsorbent will be:A. 1B. 1.5C. 0.25D. 2.5 |
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Answer» Correct Answer - A Log`x/M = log k + 1/n log P` `1/n = tan 45^2` 1n `k = 0.69` `n=1 k=2` `x/m = 2xx(0.5)^(1)` `x = 1`. |
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| 255. |
Which is not the correct statement for a catalyst?A. It does not alter EaB. It provides an alternate mechanism with a lower energy of activationC. Catalyst may form intermediates with the reactantsD. Action of enzyme catalyst is always specific |
| Answer» Correct Answer - A | |
| 256. |
Opal (mineral with liquid inclusions) is a :A. Gel (liquid dispersed in solid phase)B. Solid sol (solid dispersed in solid phase)C. Sol (solid dispersed in liquid)D. Foam (gas dispersed in liquid) |
| Answer» Correct Answer - A | |
| 257. |
Shape selective catalyst are so called because of :A. The shape of the catalystsB. The specificity of the catalystsC. The size of the pores of the catalysts which can trap only selective moleculesD. Their use for only some selected reactions |
| Answer» Correct Answer - C | |
| 258. |
Silt in water is :A. GelB. SolC. AerosolD. Emulsion |
| Answer» Correct Answer - B | |
| 259. |
Which of the following statements are correct ? (i) When an animal hide, which has negatively charged particles , is soaked in tannin, which contains positively charged colloidal particles, mutual coagulation does not take place. (ii) Photographic films are prepared by coating an emulsion of the light sensitive silver bromide in gelatin over glass plates or celluloid films. (iii) Latex is a colloidal solution of rubber particles which are negatively charged. (iv) In Cottrell precipitator , the smoke , before it comes out from the chimney, is led through a chamber containing plates having a charge opposite to that carried by smoke particles. The particles on coming in contact with these plates acquire some charge and do not get precipitated .A. (i) and (iv) onlyB. (ii) and (iii) onlyC. (ii), (iii) and (iv) onlyD. All of these. |
| Answer» Correct Answer - B | |
| 260. |
Fill in the blanks by putting appropriate choices. Blood is a colloidal solution of an `overset((i))(__________)` substance. The stypic action of `overset((ii))(__________)` and `overset((iii))(__________)` solution is due to `overset((iv))(__________)` of blood forming a clot which stops further bleeding .A. `{:("(i)","(ii)","(iii)","(iv)"),("albumoid","aluminium","ferrous chloride","peptization"):}`B. `{:("(i)","(ii)","(iii)","(iv)"),("albumoid","alum","ferric chloride ferric ","coagulation"):}`C. `{:("(i)","(ii)","(iii)","(iv)"),("electrolytic","alum","ferric chloride ","circulation "):}`D. `{:("(i)","(ii)","(iii)","(iv)"),("negatively charged","chrome alum","sodium chloride ","coagulation"):}` |
| Answer» Correct Answer - B | |
| 261. |
Following are various types of colloids. Match column X with column Y. `{:(X,"(Colloids)",Y,"(Classification)"),(I,"Rain cloud",A," Sol"),(II,"Gelatin",B," Aerosol"),(III,"Soap suds",C," Gel"),(IV,"Butter",D," Foam"):}` Correct matching is :A. `{:(I,II,III,IV),(A,B,C,D):}`B. `{:(I,II,III,IV),(A,C,B,D):}`C. `{:(I,II,III,IV),(B,A,D,C):}`D. `{:(I,II,III,IV),(B,A,C,D):}` |
| Answer» Correct Answer - C | |
| 262. |
Match the column I with Column II and mark the appropriate choice. A. `(A) to (iii), (B) to (iv), (C) to (i), (D) to (ii) , (E) to (vi), (F) to (v)`B. `(A) to (i), (B) to (vi), (C) to (v), (D) to (iii) , (E) to (iv), (F) to (ii)`C. `(A) to (vi), (B) to (iv), (C) to (v), (D) to (ii) , (E) to (iii), (F) to (i)`D. `(A) to (ii), (B) to (iii), (C) to (iv), (D) to (v) , (E) to (vi), (F) to (i)` |
| Answer» Correct Answer - A | |
| 263. |
Match the column I with Column II and mark the appropriate choice. A. `(p) to (iv), (q)to (iii), (r) to (ii), (s) to (i)`B. `(p) to (iv), (q)to (i), (r) to (iii), (s) to (ii)`C. `(p) to (i), (q)to (iv), (r) to (ii), (s) to (i)`D. `(p) to (i), (q)to (ii), (r) to (iv), (s) to (iii)` |
| Answer» Correct Answer - C | |
| 264. |
Match the column I with column II respect to applications of properties of colloids in different fields and mark the appropriate choice. A. `(A) to (iii) , (B) to (i), (C) to (ii) , (D) to (iv)`B. `(A) to (iii) , (B) to (iii), (C) to (i) , (D) to (iv)`C. `(A) to (iii) , (B) to (i), (C) to (iv) , (D) to (ii)`D. `(A) to (i) , (B) to (iv), (C) to (iii) , (D) to (ii)` |
| Answer» Correct Answer - C | |
| 265. |
Name the dispersed phase and a dispersion medium in the fog colloidal systems. |
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Answer» Fog : Dispersed phase `to` liquid Dispersion medium `to` gas |
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| 266. |
Match the column I with Column II and mark the appropriate choice. A. `(A) to (i) , (B) to (iii), (C) to (ii), (D) to (iv)`B. `(A) to (ii) , (B) to (i), (C) to (iii), (D) to (iv)`C. `(A) to (iii) , (B) to (iv), (C) to (ii), (D) to (i)`D. `(A) to (iv) , (B) to (ii), (C) to (i), (D) to (iii)` |
| Answer» Correct Answer - C | |
| 267. |
Fog is a colloidal system of :-A. liquid in gasB. gas in liquidC. solid in gasD. gas in solid |
| Answer» Correct Answer - A | |
| 268. |
The size of colloidal particle isA. `10^(-7)-10^(-9)` cmB. `10^(-9) to 10^(-11)` cmC. `10^(-5) to 10^(-7)` cmD. `10^(-2) to 10^(-3)` cm |
| Answer» Correct Answer - C | |
| 269. |
Gold number is associated withA. only lyophobic colloidsB. only lyophilic colloidsC. Both lyophobic and lyophilic colloidsD. None of these |
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Answer» Correct Answer - B Gold number is assoicated with only lyophilic colloids due to protective nature. |
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| 270. |
Size of colloidal particle isA. 1 nmB. 1-100 nmC. gt100 nmD. gt1000 nm |
| Answer» Correct Answer - B | |
| 271. |
Which of the following ionic substances will be most effective in precipitating the sulphur sol? a. `KCl` `BaCl_(2)` c. `Fe_(2)(SO_(4))_(3)` d. `Na_(3)PO_(4)` |
| Answer» The sulphor sol is negatively charged and would be coagulated most effectively by `Al^(3+)` . The sulphor sol is negatively charged and would be coagulated most effectively by `Al^(3+)` . | |
| 272. |
Tyndall effect in colloidal solution is due toA. Trace out the path of strong beam of lightB. CoagulateC. Show electrophoresisD. Show brownian movement |
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Answer» Correct Answer - A Tyndall effect is due to the fact that colloidal particles absorb light energy ad then scatter in all directions in space, this scattering of light illuminates the path of beam in colloidal dispersion. |
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| 273. |
Gold number is associated with :A. Amount of goldB. Protective colloidsC. Purple of cassiusD. Electrophoresis |
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Answer» Correct Answer - B The protective power of a colloid is expressed as gold number. |
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| 274. |
Sulphur sol contains :A. discrete sulphur atomsB. Discrete sulphur moleculesC. Large aggregates of sulphur moleculesD. Water dispersed in solid sulphur |
| Answer» Correct Answer - C | |
| 275. |
When freshly precipitated `Fe(OH)_(3)` is shaken with aqueous solution of `FeCl_(3)`, a colloidal solution is formed. The process is known as :A. CoagulationB. PeptizationC. ElectrodispersionD. Dialysis |
| Answer» Correct Answer - B | |
| 276. |
On adding few drops of dilutie `HCl` or `FeCl_(3)` to freshly precipitated ferric hydroxide a red coloured colloidal solution is obtained. The phenomenon is know asA. PeptizationB. DialysisC. Protective actionD. Dissolution |
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Answer» Correct Answer - A The phenomenon of converting of fresh mass into colloidal state by the action of sloute or solvent is known as peptization. |
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| 277. |
Assertion(A): All enzymes are proteins, but all proteins are not enzymes. Reason(R): Enzymes are biocatalysts and posses a stable configuration having active sites.A. If both (A) and (R) are correct, and (R) is the correct explanation of (A)B. If both (A) and (R) are correct, but (R) is the correct explanation of (A).C. If (A) is correct, but (R) is incorrect.D. If (A) is incorrect, but (R) is correct. S |
| Answer» Correct Answer - D | |
| 278. |
Substances which behave as normal electrolytes in solution at low concentration and exhibit colloidal properties at higher concentration are calledA. lyophilic colloidsB. lyophobic colloidsC. macromolecular colloidsD. associated colloids. |
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Answer» Correct Answer - D At higher concentration the aggregated particles called micelles are formed by electrolytes like soap which act as colloidal particles. |
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| 279. |
Assertion (A) Detergents with low CMC are more economical to use. Reason (R) Cleansing action of detergents involves the formation of micelles. These are formed when the cocentration of detergents becomes equal to CMC.A. Assertion and reson both are correct and the reason is correct explation os assertion.B. Assertion and reson both are correct but reason does not explain assertion.C. Assertion is correct but reason is incorrect.D. Both assertion and reason are incorrect. |
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Answer» Correct Answer - a Reason is correct explanation for assertion. |
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| 280. |
The substances which behave as colloidal solutions at higher concentration are calledA. associated colloidsB. multimolecular colloidsC. macromolecular colloidsD. protective colloids. |
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Answer» Correct Answer - A Substances whose molecules aggregate spontaneously in a given solvent to form particles of colloidal dimensions are called associated colloids or micelles. |
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| 281. |
The formation of micelles takes place only aboveA. critical temperatureB. kraft temperatureC. inversion temperatureD. absolute temperature |
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Answer» Correct Answer - B The formation of micelles takes place only above a particular temperature called Kraft temperature `(T_(k))` . |
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| 282. |
At the critical micelle concentration, the surfactant molecules :A. dissociateB. associateC. become bigger in size due to adsorptionD. become smaller in size due to decomposition. |
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Answer» Correct Answer - B At CMC, the particles of an electrolyte aggregate and form associated colloids known as micelles. |
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| 283. |
In a soap micelle , the soap molecules are arranged radially with:A. molecular collidB. associated collidC. macromolecular colloidD. lyophilic colloid |
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Answer» Correct Answer - B is the correct answer. |
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| 284. |
Assertion (A) An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles. Reason (R) Pore size of the filter paper becomes more than the size of colloidal particle.A. Assertion and reason both are correct and the reason is correct explanation of assertion.B. Assertion and reason both are correct but reason does not explain assertion.C. Assertion is correct, but reason is incorrect.D. Both assertion and reason are incorrect. |
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Answer» Correct Answer - C An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles because pore size of the filter paper becomes smaller than the size of colloidal particles. |
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| 285. |
Collodion is a `4%` solituon of which one of the following in alcohol-enter mixture ?A. nitrocerineB. callulose acetateC. glycoldi nitrateD. nitrocellulose |
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Answer» Correct Answer - D It is `4%` solution of notrocellulose in alcohol-ether mixture. |
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| 286. |
Point out the false statement.A. Colloidal sols are homogeneousB. Colloids carry + ve or -ve chargesC. Colloids show Tyndall effect.D. The size range of colloidal particles is 10-1000 A |
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Answer» Correct Answer - A Colloidal sols are hetergeneous in nature. |
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| 287. |
Which of the folowing process does not occur at the interface of phases?A. CrystallisationB. Hetergeneous catalysisC. Homogeneous catalysisD. Corrosion |
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Answer» Correct Answer - C Homogeneous catalysis does not occur at the interface of phases as in case of homogeneous catalysis reactant and catalyst have same phase and their distribution is uniform throughout. |
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| 288. |
At the equilibrium position in the process of adsorption …………A. `Delta H gt 0`B. `Delta H=T Delta S`C. `Delta H gt T Delta S`D. `Delta H lt T Delta S` |
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Answer» Correct Answer - B As we know that, at equilibrium `Delta G=0` `" " Delta H-T Delta S=0` ` " " Delta H=T Delta S` Hence, at equilibrium change is equal is equal to product of temperature and entropy change. |
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| 289. |
Which of the folowing process does not occur at the interface of phases?A. crystallisationB. heterogenous catalysisC. homogeneous catalysisD. corrosion |
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Answer» Correct Answer - C Hemogenous catalysis does not accur at the interface of phases. |
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| 290. |
`1 g` charcoal is placed in `100 mL` of `0.5 M CH_(3)COOH` to form an adsorbed mono-layer of acetic acid molecule and thereby the molarity of `CH_(3)COOH` reduces to `0.49`. Calculate the surface area of charcoal adsorbed by each molecule of acetic acid. Surface are of charocal `=3.01xx10^(2)m^(2)//g`. |
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Answer» Correct Answer - `5xx10^(19)m^(2)` 2. Initial millimoles of `CH_(3)COOH=100xx0.5=50` Final millimoles of `CH_(3)COOH=100xx0.49=49` Millimoles adsorbed `=50-49=1` Moles adsobed `=(1)/(1000)` Molecules adsorbed `=(1)/(1000)xx6.023xx10^(23)` `=6.023xx10^(20)` Area per molecule `=("Total area")/("Number of molecules")` `=(3.01xx10^(2))/(6.023xx10^(20))` `5xx10^(19)m^(2)` |
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| 291. |
`2.0 g` of charcoal is placed in `100 mL` of `0.05 M CH_(3)COOH` to form an adsorbed mono-acidic layer of acetic acid molecules and thereby the molarity of `CH_(3)COOH` reduces to `0.49`. The surface area of charcoal is `3xx10^(2) m^(2)g^(-1)`. The surface area of charcoal is adsorbed by each molecule of acetic acid is a. `1.0xx10^(-18)m^(2)` b. `1.0xx10^(-19)m^(2)` c. `1.0xx10^(13)m^(2)` d. `1.0xx10^(-22)m` |
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Answer» `CH_(3)COOH` adsorbed `=0.5-0.49=0.01M` Number of molecules adsorbed `=0.01xx(100)/(1000)xx6xx10^(23)=6xx10^(20)` Total area of charcoal `=2xx3xx10^(2)=600m^(2)` implies Area per molecule `=(600)/(6xx10^(20))=1xx10^(-18)m^(2)` `CH_(3)COOH` adsorbed `=0.5-0.49=0.01M` Number of molecules adsorbed `=0.01xx(100)/(1000)xx6xx10^(23)=6xx10^(20)` Total area of charcoal `=2xx3xx10^(2)=600m^(2)` implies Area per molecule `=(600)/(6xx10^(20))=1xx10^(-18)m^(2)` |
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| 292. |
In the Haber process of synthesis of `NH_(3)` :A. Mo acts as a catalyst and Fe as a promoterB. Fe acts as a catalyst and Mo as a promoterC. Fe acts as inhibitor & Mo as a catalystD. Fe acts as promoter & Mo as auto-catalyst |
| Answer» Correct Answer - B | |
| 293. |
Which of the following statements about catalysts is /are true ?A. It lowers the energy of activationB. The catalyst altered during the reaction is regeratedC. It does not alter the equilibriumD. All of these |
| Answer» Correct Answer - D | |
| 294. |
In the reaction `KMnO_(4) + H_(2)SO_(4) + H_(2)C_(2)O_(4) to` products, `Mn^(2+)` ions act as:A. Positve catalystB. Negative catalystC. Auto catalystD. Enzyme catalyst |
| Answer» Correct Answer - C | |
| 295. |
Efficiency of the catalysts depends on its :A. Molecular weightB. Number of free valenciesC. Physical stateD. Amount used |
| Answer» Correct Answer - B | |
| 296. |
Which of the following types of metal form the most efficient catalysts?A. Transition metalsB. Alkali metalC. Alkaline earth metalsD. Radioactive metals |
| Answer» Correct Answer - A | |
| 297. |
An oil-soluble dye is mixed with emulsion and the emulsion remains colourless. Then, it isA. O-in-WB. W-in-OC. O-in-OD. W-in-W |
| Answer» Correct Answer - A | |
| 298. |
Which of the following is not a characteristic of chemisorption?A. It is irreversible.B. It is specific.C. It is multilayer phenomenon.D. Heat of adsorption is about `-400KJ` . |
| Answer» Correct Answer - C | |
| 299. |
Oil-soluble dye is mixed with water-in-oil emulsion, thenA. Dispersion medium is colouredB. Dispersed phase is colouredC. Both colouredD. None is coloured |
| Answer» Correct Answer - A | |
| 300. |
Chromatography is a technique based on.A. Adsorption and then desorption of soluteB. Absorption of soluteC. Hydration of soluteD. Evaporation of solute |
| Answer» Correct Answer - A | |