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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.
| 1051. |
Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. `{:("column-I","column-II"),("(A) Chemisorption","(P) Not specific and decreases with temperature "),("(B) physisorption",(Q) "sepecific and increases with temperature"),("(C) Desorption of a solute on liquid surface","(R) Increases the surface tension of the liquid "),("(D)Adsorption of a solute on a liquid ","(S) Decreases the surface tension of the liquid "):}` |
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Answer» Correct Answer - `AtoQ; B to P; C to R; D to S ` |
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| 1052. |
Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II.`{:("column-I","column-II"),("(A) Coagultation ","(P) Due to persence of charge "),("(B) Electrophoresis ",(Q) " Due to scattering of light "),("(C) tyndall effect","(R) Due to netralization of charge "),("(D)Brownian movement","(S) Due to impact of the molecules of the dis-persion medium with colloidal particles "):}` |
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Answer» Correct Answer - `A to r; B to P; C to Q ; D to S` |
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| 1053. |
Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II.`{:("column-I","column-II"),((A) As_(2)S_(3)"sol","(P) Lyophobic colloid"),("(B) sulphur sol ",(Q) " Macromolecualr colloid"),("(C) starch","(R) Multimolecular colloid "),("(D)Soap","(S) Associated colloid "):}` |
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Answer» Correct Answer - `A to P,R; B to P,R ; C to Q ; D to S` |
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| 1054. |
Statements : Gelation is foten used as protective colloid. Expabnations : Protection is a property of lyophilic collids .A. S is correct but E is wrong .B. S is worong but E is correctC. Both S and E are correct and E is correct explanation of (S) .D. Both S and E are correct but E is not correct explanation of S. |
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Answer» Correct Answer - D Both are different facts but treue. |
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| 1055. |
Assertion : Gelatin is often used as a protective colloid. Reason : Protection is the property of lyophilic colloids.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. |
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Answer» Correct Answer - B Correct explanation. Gelation froms a protective coating around are Lyophobic sol. |
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| 1056. |
the protective power of the lyophilic colloids es expressed in terms of gold number, a term introduced by Zsigmondy. Gold number is the number of milli - gram of the protective colloid which prevent the coagulation of 10 mLof red gold sol , when 1 mL of a 10 per cent solution of sodium chloride is added to it . thus smaller the gold number of lyophillic colloid, the greater is the protective power. gold number given an indication ofA. protective nature of colloidsB. purity of gold in suspensionC. the charge on a colloidal soultion of goldD. gram of gold per litre of soultion |
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Answer» Correct Answer - a |
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| 1057. |
Assertion: Gold number is the measure of protective powers of differents colloids. Reason: The smaller the gold number of lyophilic colloid, the smaller is its protective power.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 and the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - C Gold number `prop (1)/("protecting power of lyophilic colloid")` |
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| 1058. |
Greater is the protective power of lyophilic colloidA. Lesser is its gold no.B. Greater is its gold no.C. Either of the above.D. None |
| Answer» Correct Answer - A | |
| 1059. |
Name any four examples of preparation of colloids by chemical methods with necessary chemical equations. |
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Answer» Chemical methods : Colloidal solutions are prepared by chemical reactions leading to the formation of species by double decompositon , oxidation , reduction or hydrolysis . These species then aggregate leading to the formation of sols. `As_(2)O_(3) +3H_(2)S overset("Double decomposition") to As_(2)S_(3) ("sol") + 3H_(2)O` `SO_(2) + 2H_(2)S overset("Oxidation")to 3S("sol)+ 2H_(2)O` `2AuCl_(3) + 3HCHO + 3H_(2)O overset("Hydrolysis ")to Fe(OH)_(3) ("sol") + 3HCl` |
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| 1060. |
Which one is false in the following statement?A. A catalyst is specific in its actionB. A very small amount of the catalyst can alter the rate of a reaction.C. The number of free valencies on the surface of the catalyst increases on sub-divisionD. Ni is used as a catalyst in the manufacture of ammonia |
| Answer» Correct Answer - D | |
| 1061. |
Introduction of two drops of concentrated sulphuric acid, `H_(2)SO_(4)`, speeds up an esterification reaction. Introduction of a piece of platinum metal, Pt, speeds up the reaction of `H_(2)` and `O_(2)` gas. Which of the following statements is true?A. Pt is a homogeneous catalyst, `H_(2)SO_(4)` is a heterogeneous catalyst.B. Pt is a heterogeneous catalyst, `H_(2)SO_(4)` is a homogeneous catalyst.C. Pt and `H_(2)SO_(4)` are both heterogeneous catalysts.D. Pt and `H_(2)SO_(4)` are both homogeneous catalysts. |
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Answer» Correct Answer - B |
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| 1062. |
A catalyst increases rate of reaction byA. Decreasing enthalpyB. Decreasing internal energyC. Decreasing activation energyD. Increasing activation energy |
| Answer» Correct Answer - C | |
| 1063. |
Air can oxidize sodium sulphite in eq. solution but cannot do so in the case of sodium arsenite. If however, air is passed through a solution containing both sodium sulphite & sodium arsenite then both are oxidized. This is an example of :-A. Positive catalysisB. Negative catalysisC. Induced catalysisD. Auto catalysis |
| Answer» Correct Answer - C | |
| 1064. |
When a catalyst increases the rate of chemical reaction the rate constant :-A. IncreasesB. DecreasesC. Remains constantD. Becomes infinite |
| Answer» Correct Answer - A | |
| 1065. |
A catalyst speeds up a chemical reraction byA. shifting the equilibriumB. increasing the activation energyC. initiating the reactionD. decreasing energy of activation |
| Answer» Correct Answer - D | |
| 1066. |
TEL, tetraethyl lead, acts as antiknocking agent. It acts as……………………… catalyst. |
| Answer» Correct Answer - Negative | |
| 1067. |
Peptisation is :A. conversion of a colloidal into precipitate formB. Conversion of precipitate into colloidal solC. conversion of metal into colloidal sol by passage of electric currentD. Conversion of colloidal sol into macromolescules |
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Answer» Correct Answer - B Process by which precipitate is converted into colloid is known as peptisation. |
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| 1068. |
Which of the following is property of colloid?A. Scattering of lightB. They shown attractionC. DialysisD. Emulsion |
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Answer» Correct Answer - A Scattering of light is a property of colloid. |
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| 1069. |
Collidal solutios of gold prepared by different methods are of different colours because ofA. Different diameters of colloidal gold particlesB. Variable valency of goldC. Different concentrations of gold particlesD. Impurites produced by different methods |
| Answer» Correct Answer - A | |
| 1070. |
If some gelatin is mixed in collidal solution of gold, then it doesA. Coagulation of goldB. Peptization of goldC. protection of gold solD. protction of gelatin |
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Answer» Correct Answer - C Some gelatin is mixed in colloidal solution of gold to form ppt. of gold (peptization of gold). Because formation of layer on colloidal particle. |
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| 1071. |
The collidal solutions of gold prepared by different methods have different colurs due to :A. differece in the size and shape :B. the fact that gold exthbits varible valebncyC. different concentration of goldD. presence of different types of collodal particles |
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Answer» Correct Answer - A The colour of any sol depends on its particle size and shape . Au sol is red if particles are speherical and blue of they are disc like . |
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| 1072. |
The addition of alcohol to a saturated aqueous solution fo calucium acetate first forms a sol and them sets to a gelatinous mas scalled solid alcohnlo ehich is a:A. solid solB. aerosolC. solid form gelD. gel |
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Answer» Correct Answer - D The solid in liquid system sets on giving the formation of liquid in solid system , i.e., gel formation . |
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| 1073. |
Shape-selective catalysis is a reaction catalysed by:-A. ZeolitesB. EnzymesC. PlatinumD. Zeigler-Natta catalyst |
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Answer» Correct Answer - A Zeolite is most widely studies shape selective catalyst. Shape selectivity of zeolite depends upon pore structure of the catalyst, pore size generally varies between 260 pm to 740 pm. Such catalyst are highly specific. It is because molecules of only a particular size and shape enter these pores and get adsorbed. |
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| 1074. |
Shape selective catalysis is a reaction catalysed byA. zerolitesB. enzymesC. platinumD. Ziegler-Natta catalyst. |
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Answer» Correct Answer - A Zeolite is a most widely studied shape-selective catalyst. Shape selectivity of zeolite depends upon between 260 pm to 740 pm. Such catalysts are highly specific because molecules of only a particular size and shape enter these pores and get adsorbed. |
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| 1075. |
Explain the following terms `:` `{:(a. El etropho resis , b. Coagulation),(c. Dialysis,d.Tyndall effect):}` |
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Answer» (i) Electrophoresis: (ii) Coagulation or precipitation: The stability of the lyophobic sols is due to the presence of charge on colloidal particles. If somehow, the charge is removed, the particles will come nearer to each other to form aggregates (or coagulate) and settle down the force of gravity. The process of setting down of colloidal particles is called coagulation. (iii) Dialysis: It is the process of removing dissolved substances from a colloidal solution by means of diffusion through a suitable membrane. Since particles (ions or smaller molecules) in a true solution can pass through animal membrane (bladder) or parchment paper or cellophane sheet but not the colloidal particles, the membrane can be used for dialysis. The apparatus used for this purpose is called dialyser. A bag of suitable membrane containing the colloidal solution is suspended in a vessel through which fresh water is continuously flowing. The molecules and ions diffuse through membrane into the outer water and pure colloidal solution is left behind. (iv) Tyndall effect: |
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| 1076. |
Adsorption is the tendency of accumulation of molecular species at the surface of solid or liquid. Depending upon the nature of bonds or forces of attraction between adsorbate and adsorbent. It is classofied between physisorption and chemisorption. Which of the following statements are correct? (More than one correct)A. Adsorption always leads to a decrease in enthalpy and entropy of the system.B. Adsorption arises due to unsaturation in the enthalpy of valency force of atoms or molecules on the surface.C. Adsorption increases with rise in temperature.D. Adsorption decreases the surface energy. |
| Answer» Correct Answer - A::B::DCorrect Answer - A::B::D | |
| 1077. |
which of the following electrolyte will be most effective in coagulation of negative sol ?A. `KNO_(3)`B. `K_(4)[fe(CN)_(6)]`C. `Na_(3)PO_(4)`D. `MgCl_(2)` |
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Answer» Correct Answer - d |
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| 1078. |
What is the main cause of cahrge on a colloidal solution? |
| Answer» The charge on the colloidal particles is due to the adsorption of common ions of the electrolyte on the surface of the colloidal particles, e.g., `Fe^(3+)` from `FeCl_(3)` on the surface of `Fe(OH)_(3)` particles. The charge on the colloidal particles is due to the adsorption of common ions of the electrolyte on the surface of the colloidal particles, e.g., `Fe^(3+)` from `FeCl_(3)` on the surface of `Fe(OH)_(3)` particles. | |
| 1079. |
What is electrodialysis? |
| Answer» It is a process by which colloidal solutions containing ionic impurities are purified. The colloidal solution containing ionic impurites is placed in a bag of parchment paper in distilled water electric field. The ions come out through parchment paper and the sol is purified. It is a process by which colloidal solutions containing ionic impurities are purified. The colloidal solution containing ionic impurites is placed in a bag of parchment paper in distilled water electric field. The ions come out through parchment paper and the sol is purified. | |
| 1080. |
The adsorption of gas on a solid surface varies with pressure of the gas in which of the following manner.A. fast `rarr` slow `rarr` independent of the pressureB. slow `rarr` fast `rarr` independent of the pressureC. Independent of the pressure `rarr` fast `rarr` slowD. Independent of the pressure `rarr` slow `rarr` fast |
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Answer» Correct Answer - A Adsorption of a gas on solid independent to the pressure start fast and after some time becomes slow. |
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| 1081. |
When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged withA. `Ca^(2+) or Mg^(2+)` ions in zeolite are replaced by `Na^(+)` ions in hard water.B. Ca^(2+)` ions in zeolite are replaced by `Mg^(2+)` ions in hard water.C. `Na^(+)` ions in zeloite are replaced by `Ca^(2+)` and `Mg^(2+)` ions in hard water.D. None is correct. |
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Answer» Correct Answer - C It is the correct answer, `Ca^(2+) and Mg^(2+)` ions which make water hard are replaced by `Na^(+)` ions of zeolite, |
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| 1082. |
Softening of hard water is done using sodium aluminium silicate (zeolite) . This causesA. Adsorption of `Ca^(2+)` and `Mg^(2+)` ions of hard water replacing `Na^(o+)` ions.B. Adsorption of `Ca^(2+)` and `Mg^(2+)` ions of hard water replacing `Al^(3+)` ions.C. Both (a) and (b) are trueD. None is true |
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Answer» Correct Answer - A Hardness of water is due to carbonate or sulphate of `Ca^(2+)` and `Mg^(2+)` inos. When sodium aluminium silicate is added `Na^(o+)` replaces `Ca^(2+)` and `Mg^(2+)` by adsorption, and hence water becomes soft. |
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| 1083. |
Softening of hard water is done using sodium aluminium silicate (zeolite) . This causesA. adsorption of `Ca^(2+)` and `Mg^(2+)` ions of hard water replacing `Na^(+)` ions.B. adsorption of `Ca^(2+)` and `Mg^(2+)` ions of hard water replacing `Al^(3+)` ions.C. both (a) and (b)D. none of these |
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Answer» Correct Answer - A Softening of hard water: ion exchange resisns used for softening of hard water is based upon sensitive and competitive adsorption of ions on resins. `Na_(2)Z+Ca^(2+) rarr CaZ+2Na^(+)` the organic polymers containing groups like `-COOH, -SO_(3)H` and `-NH_(2)`, etc. possess the property of selective adsorption of ions from solution. These are quite useful in the softening of water. |
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| 1084. |
Softening of hard water is done using sodium aluminium silicate (zeolite) . This causesA. adsorption of `Ca^(2+)` and `Mg^(2+)` ions of hard water replacing `Na^(+)` ions.B. adsorption of `Ca^(2+)` and `Mg^(2+)` ions of hard water replacing `Al^(3+)` ions.C. both (a) and (b)`D. none of the above |
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Answer» Correct Answer - A |
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| 1085. |
Which is not purely surface phenomena?A. Surface tensionB. AdsorptionC. AbsorptionD. None of these |
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Answer» Correct Answer - C |
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| 1086. |
3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06 N) in a flask. After an hour, It was filtered and the strength of the filtrate was found to be 0.42 N. Calculate the amount of acetic acid adsorbed per gram of charcoal.A. 32 mgB. 42 mgC. 54 mgD. 18 mg |
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Answer» Correct Answer - D It is the correct anser. For details, consult Example 3 (Text-part) |
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| 1087. |
The pressure of the gas was found to decrease from 720 to `480 m`. When `5g` of sample of activated charcoal was kept in a flask of one litre capacity maintained at `27^(@)C` . If the density of charcoal at `1.25 gm//mL`. The volume of gas adsorbed per `gm` of charcoal at `480 mm` of `Hg` isA. `80.03 mL`B. `32.20 mL`C. `100.08mL`D. None of these |
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Answer» Correct Answer - 3 `V_(2)=(P_(1)V_(1))/(P_(2))=(720xx1000)/(480)=1500ml` Volume of gas in the flask `=1000-` volume of charcoal `1000-(5)/(1.25)=996ml` Total volume of gas adsorbe by charcoal `=1500-996=504ml` Volume of gas adsorbe by per gram of charcoal `=(504)/(5)=100.08ml` `V_(2)=(P_(1)V_(1))/(P_(2))=(720xx1000)/(480)=1500ml` |
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| 1088. |
The pressure of the gas was found to decrease from 720 to 480 mm. When 5g of sample of activated charcoal was kept in a flask of one litre capacity maintained at `27^(@)C`. If the density of charcoal is `1.25 gm//mL`. The volume of gas adsorbed per gm of charcoal at 480 mm of Hg is :A. `80.03 mL`B. `32.20 mL`C. `100.08 mL`D. `100.61 mL` |
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Answer» Correct Answer - D |
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| 1089. |
Calculate the ionic mobility of colloidal particles in arsenic colloidal solution, if zeta potential is `0.045 V` (Dielectric constant = 81, Viscosity of liquid` = 1.008` centipoise) |
| Answer» Correct Answer - `2.88 cm^(2) "volt"^(-1)s^(-1).` | |
| 1090. |
Which of the following statements is not correct for the catalyst?A. It catalyses the forward and backward reaction to the same extentB. It alters `DeltaG` for the reactionC. It does not change the equilibrium constant ofa reactionD. It provides an alternate mechanism by reducing activation energy between the reactants and products. |
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Answer» Correct Answer - B A catalyst cannot alter `DeltaG` of a reaction. |
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| 1091. |
The phenomenon of converting colloidal solution into suspension is known as………………… |
| Answer» Correct Answer - Coagulation or flocculation | |
| 1092. |
The coagulating power of electrolytes having inos `Na^(o+),Al^(3+)` and `Ba^(2+)` for arsenic sulphide sol increases in the orderA. `Na^(o+)ltBa^(2+)ltAl^(3+)`B. `Ba^(2+)ltNa^(o+)ltAl^(3+)`C. `Al^(3+)ltNa^(o+)ltBa^(2+)`D. `Al^(3+)ltBa^(2+)ltNa^(o+)` |
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Answer» Correct Answer - A `As_(2)S_(3)` is an anionic sol (negative sol) hence coagulation will depend upon coagulation power of cation which is directly proportional to the valency of cation (Hardy-Schulze rule). |
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| 1093. |
The coagulating power of electrolytes having inos `Na^(o+),Al^(3+)` and `Ba^(2+)` for arsenic sulphide sol increases in the orderA. `Na^(+),Al^(+3),Ba^(+2)`B. `PO_(4)^(-3),SO_(4)^(-2),Cl^(-)`C. `Al^(+3),Ba^(+2),Na^(+)`D. `Cl^(-),SO_(4)^(-2),PO_(4)^(-3)` |
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Answer» Correct Answer - C According to Hardy-Schulze rule. |
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| 1094. |
After the reactio is over between adsorbed reactants, it is important to create space for the other reactant molecules to approach the surface and react. The process responsible for this is known asA. sorptionB. desorptionC. physisorptionD. chemisorption |
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Answer» Correct Answer - B Desorption removes products from the surface to create space for the reactants. |
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| 1095. |
Which is/are correct about protective colloids?A. Haemoglobin cannot be used as a protective colloidsB. Protective colloids are responsible for the stability of paints ink etcC. Lyophobic colloids act as protective colloidsD. Gelatin is a better protective colloid than gum arabic |
| Answer» Correct Answer - B::D | |
| 1096. |
Colloids can be prepared byA. Tyndall effectB. ElectrophoresisC. DialysisD. Peptization |
| Answer» Correct Answer - D | |
| 1097. |
Easily liquefiable gases are readily adsorbed on solids . Why? |
| Answer» Easily liquefiable gases are readily adsorbed on solids because vander waal’s forces are stronger near the critical temperatures. | |
| 1098. |
In general , which of the following gets adsorbed readily ?A. Permanent gasesB. Easily liquefiable gasesC. All gases have same adsorbing tendencyD. None of the above . |
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Answer» Correct Answer - B Because easily liquefiable gases have high value of critical temperature . |
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| 1099. |
Assertion : During adsorption, `DeltaG, DeltaH and DeltaS` decrease i.e., their values become negative. Reason : Adsorption is a spontaneous process. Randomness ofr disorder decreases during adsorption.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. |
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Answer» Correct Answer - A Reason is the correct explanation for assertion. |
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| 1100. |
Which of the following is true during adsorption? a. `DeltaG` , `DeltaH` , and `DeltaS` all are negative. b. `DeltaG` is negative, but `DeltaH` and `DeltaS` is positive. c. `DeltaG` and `DeltaH` are negative, but `DeltaS` is positive. d. `DeltaG` and `DeltaS` are negative, but `DeltaH` is positive. |
| Answer» Correct Answer - Positive, negative | |