NEET Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank

done Self Evaluation Test - Surface Chemistry Total Questions - 70

• question_answer1)
  The volume of gases \[N{{H}_{3}},C{{O}_{2}}\] and \[{{H}_{2}}\]adsorbed by one gram of charcoal at 300 K are in order of:
  A)
  \[{{H}_{2}}>C{{O}_{2}}>N{{H}_{3}}\]         done clear
  B)
  \[N{{H}_{3}}>{{H}_{2}}>C{{O}_{2}}\] done clear
  C)
  \[N{{H}_{3}}>C{{O}_{2}}>{{H}_{2}}\] done clear
  D)
  \[C{{O}_{2}}>N{{H}_{3}}>{{H}_{2}}\] done clear
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• question_answer2)
  A plot of \[log\left( \frac{x}{m} \right)\] against log P for the adsorption of a gas on a solid gives a straight line with slope equal to:    
  A)
  \[\frac{1}{n}\]                           done clear
  B)
  n      done clear
  C)
  \[log\text{ }K\]               done clear
  D)
  K done clear
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• question_answer3)
  The heat evolved in chemisorption lies in the range (in kJ/mol) of:
  A)
  80 to 240           done clear
  B)
  20 to 40 done clear
  C)
  40 to 80            done clear
  D)
  20 to 100 done clear
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• question_answer4)
  Identify the correct statement regarding enzymes____.
  A)
  Enzymes are specific biological catalysts that cannot be poisoned done clear
  B)
  Enzymes are normally heterogeneous catalysts that are very specific in their action done clear
  C)
  Enzymes are specific biological catalysts that can normally function at very high temperatures \[(T\approx 1000K)\] done clear
  D)
  Enzymes are specific biological catalysts that possess well-defined active sites done clear
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• question_answer5)
  Catalytic poisons act by:
  A)
  making the products chemically inactive. done clear
  B)
  increasing the rate of the backward reaction. done clear
  C)
  chemical combination with any one of the reactants. done clear
  D)
  preferential adsorption on the catalyst surface. done clear
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• question_answer6)
  The size of particles in suspension, true solution and colloidal solution varies in the order:
  A)
  suspension > colloidal > true solution done clear
  B)
  true solution > suspension > colloidal done clear
  C)
  suspension > colloidal = true solution done clear
  D)
  none of these done clear
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• question_answer7)
  Gold number of a lyophilic sol is such a property that:
  A)
  The larger its value, the greater is the peptizing power. done clear
  B)
  The lower its value, the greater is the peptizing power. done clear
  C)
  The lower its value, the greater is the protecting power. done clear
  D)
  The larger its value, the greater is the protecting power. done clear
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• question_answer8)
  Among the following, correct statement is:
  A)
  Brownian movement is more pronounced for smaller particles than for bigger- particles. done clear
  B)
  Sols of metal sulphides are lyophilic. done clear
  C)
  Hardy Schuize law states that bigger the size of the ons, the greater is its coagulating power. done clear
  D)
  One would expect charcoal to adsorb chlorine more than hydrogen sulphide. done clear
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• question_answer9)
  Under the influence of an electric field, heparticles in a sol migrate towards cathode. The coagulation of the same sol is studied using \[NaCl,N{{a}_{2}}S{{O}_{4}}\]and \[N{{a}_{3}}P{{O}_{4}}\] solutions. Their coagulating values will be in the order
  A)
  \[NaCl>N{{a}_{2}}S{{O}_{4}}>N{{a}_{3}}P{{O}_{4}}\] done clear
  B)
  \[N{{a}_{2}}S{{O}_{4}}>N{{a}_{3}}P{{O}_{4}}>NaCl\] done clear
  C)
  \[N{{a}_{3}}P{{O}_{4}}>N{{a}_{2}}S{{O}_{4}}>NaCl\] done clear
  D)
  \[N{{a}_{2}}S{{O}_{4}}>NaCl>N{{a}_{3}}P{{O}_{4}}\] done clear
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• question_answer10)
  3.6 gram of oxygen is adsorbed on 1.2 g of metal powder. What volume of oxygen adsorbed per gram of the adsorbent at 1 atm and 273 K?
  A)
  \[0.19L{{g}^{-1}}\]                  done clear
  B)
  \[1L{{g}^{-1}}\] done clear
  C)
  \[2.1\text{ }L\text{ }{{g}^{-1}}\]                      done clear
  D)
  None of these done clear
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• question_answer11)
  For the graph below, select correct order of temperature?
  A)
  \[{{T}_{1}}>{{T}_{2}}>{{T}_{3}}\]               done clear
  B)
  \[{{T}_{2}}>{{T}_{3}}>{{T}_{1}}\] done clear
  C)
  \[{{T}_{3}}>{{T}_{2}}>{{T}_{1}}\]               done clear
  D)
  \[{{T}_{1}}={{T}_{2}}={{T}_{3}}\] done clear
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• question_answer12)
  100 mL of 0.6 M acetic acid is shaken with 2 g activated carbon. The final concentration of the solution after adsorption is 0.5 M. What is the amount of acetic acid adsorbed per gram of carbon? 
  A)
  0.6 g               done clear
  B)
  0.3 g done clear
  C)
  1.2 g done clear
  D)
  None of these done clear
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• question_answer13)
  The efficiency of an enzyme in catalysing a reaction is due to its capacity
  A)
  to form a strong enzyme-substrate complex done clear
  B)
  to decrease the bond energies of substrate molecule done clear
  C)
  to change the shape of the substrate molecule done clear
  D)
  to lower the activation energy of the reaction done clear
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• question_answer14)
  A chemical reaction is catalyzed by a catalyst X. Hence X
  A)
  reduces enthalpy of the reaction done clear
  B)
  decreases rate constant of the reaction done clear
  C)
  increases activation energy of the reaction done clear
  D)
  does not affect equilibrium constant of the reaction done clear
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• question_answer15)
  The gold numbers of protective colloids A, B, C and D are 0.04, 0.004, 10 and 40 respectively The protective powers of A, B, C and D are in the order:
  A)
  \[A>B>C>D\]     done clear
  B)
  \[B>A>C>D\] done clear
  C)
  \[D>C>A>B\]     done clear
  D)
  \[D>C>B>A\] done clear
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• question_answer16)
  The density of gold is\[19\text{ }g/c{{m}^{3}}\]. If \[1.9\times {{10}^{-4}}g\] of gold is dispersed in one litre of water to give a  sol having spherical gold particles of radius 10 nm, then the number of gold particles per \[m{{m}^{3}}\] of the sol will be:
  A)
  \[1.9\times {{10}^{12}}\]                      done clear
  B)
  \[6.3\times {{10}^{14}}\] done clear
  C)
  \[6.3\times {{10}^{10}}\]                      done clear
  D)
  \[2.4\times {{10}^{6}}\] done clear
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• question_answer17)
  A thixotropic gel is characterised by
  A)
  reversible transformation of gel into sol on heating done clear
  B)
  irreversible transformation of gel into sol by stirring done clear
  C)
  reversible transformation of gel into sol by stirring done clear
  D)
  swelling on placing in the dispersion medium done clear
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• question_answer18)
  In an experiment, addition of 4.0 ml of 0.005 M \[BaC{{l}_{2}}\] to 16.0 ml of arsenius sulphide sol just causes the complete coagulation in 2 hrs. The flocculating value of the effective ion is
  A)
  \[C{{l}^{-}},1.0\]                     done clear
  B)
  \[C{{l}^{-}},2.0\] done clear
  C)
  \[B{{a}^{2+}},1.0\]                done clear
  D)
  \[B{{a}^{2+}},0.5\] done clear
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• question_answer19)
  Choose the correct statement
  A)
  Latex is an example of solid-in-liquid sol done clear
  B)
  Latex is a negative sol done clear
  C)
  Latex is a positive sol done clear
  D)
  None of the above is correct done clear
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• question_answer20)
  Arrange the following electrolytes in the increasing order of coagulating power for ferric hydroxide sol

  \[N{{a}_{3}}P{{O}_{4}}\]	\[KCl\]	\[{{K}_{2}}S{{O}_{4}}\]	\[NaCI\]
  I	II	III	IV

  A)
  I<II<III<IV                   done clear
  B)
  II=IV<III<I done clear
  C)
  II=IV<I<III                   done clear
  D)
  II=III<IV=I done clear
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• question_answer21)
  Although, nitrogen does not adsorb on a surface at room temperature, it adsorbs on the surface at 83 K. Which one of the following statements is correct?
  A)
  At 83 K, there is formation of monolayer done clear
  B)
  At 83 K, nitrogen is adsorbed as atoms done clear
  C)
  At 83 K, nitrogen molecules are held by chemical bonds done clear
  D)
  At 83 K, there is formation of multimolecular layers done clear
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• question_answer22)
  The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them:
  A)
  Enthalpy of adsorption is negative done clear
  B)
  Energy appears as heat done clear
  C)
  On adsorption, the residual forces on the surface are increased done clear
  D)
  Entropy of adsorption in negative done clear
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• question_answer23)
  If x  is the mass of the gas adsorbed on mass m of the adsorbent at pressure p, Freundlich adsorption isotherm gives a straight line on plotting
  A)
  x/m vs p            done clear
  B)
  x/m vs 1/p done clear
  C)
  \[\log \,x\text{/}m\,\,vs\,\,\log \,p\] done clear
  D)
  \[log\,x/m\,\,vs\,p\] done clear
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• question_answer24)
  The correct statement for both the processes of physisorption and chemisorption is
  A)
  both are endothermic done clear
  B)
  chemisorption is endothermic but physisorption is exothermic done clear
  C)
  both are exothermic done clear
  D)
  physisorption is endothermic but chemisorption is exothermic. done clear
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• question_answer25)
  Which one of the sols acts as protective colloid?
  A)
  \[A{{s}_{2}}{{S}_{3}}\]                                   done clear
  B)
  Gelatin done clear
  C)
  Au                                done clear
  D)
  \[Fe{{\left( OH \right)}_{3}}\] done clear
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• question_answer26)
  Given below are a few electrolytes, indicate which one among them will bring about the coagulation of a gold sol quickest and in the least of concentration? 
  A)
  \[NaCl\]                         done clear
  B)
  \[MgS{{O}_{4}}\] done clear
  C)
  \[A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\]              done clear
  D)
  \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] done clear
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• question_answer27)
  Which of the following has minimum flocculation value for positively charged sol?
  A)
  \[C{{l}^{-}}\]                          done clear
  B)
  \[SO_{4}^{2-}\] done clear
  C)
  \[PO_{4}^{3-}\]                                   done clear
  D)
  \[{{[Fe{{(CN)}_{6}}]}^{4-}}\] done clear
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• question_answer28)
  Butter is a colloid formed when
  A)
  fat is dispersed in water done clear
  B)
  fat globules are dispersed in water done clear
  C)
  water is dispersed in fat done clear
  D)
  None of the these done clear
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• question_answer29)
  Cloud or fog is a colloidal system in which the dispersed phase and the dispersion medium are
  A)
  Gas, Liquid       done clear
  B)
  Liquid, gas done clear
  C)
  Liquid, liquid     done clear
  D)
  Solid, Liquid done clear
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• question_answer30)
  Which of the following constitutes irreversible colloidal system in water as dispersion medium?
  A)
  Clay                              done clear
  B)
  Platinum done clear
  C)
  \[Fe{{\left( OH \right)}_{3}}\]                  done clear
  D)
  All of these done clear
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• question_answer31)
  At the high pressure, Langmuir adsorption isotherm takes the form
  A)
  \[\frac{x}{m}=\frac{ap}{1+bp}\]                       done clear
  B)
  \[\frac{x}{m}=\frac{a}{b}\] done clear
  C)
  \[\frac{x}{m}=ap\]                    done clear
  D)
  \[\frac{m}{x}=\frac{b}{a}+\frac{1}{ap}\]   done clear
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• question_answer32)
  Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at\[25{}^\circ C\]. For this process, which of the following statement is correct?
  A)
  The adsorption requires activation at \[25{}^\circ C\] done clear
  B)
  The adsorption is accompanied by a decrease in enthalpy done clear
  C)
  The adsorption increases with increase of temperature done clear
  D)
  The adsorption is irreversible done clear
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• question_answer33)
  In an experiment, 200 mL of 0.5 M oxalic acid is shaken with 10 g of activated charcoal and filtered. The concentration of the filtrate is reduced to 0.4  M The amount of adsorption\[\left( \frac{x}{m} \right)\] is
  A)
  0.9                    done clear
  B)
  1.8   done clear
  C)
  0.18                  done clear
  D)
  0.09 done clear
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• question_answer34)
  Equal volume each of two sols of\[AgI\], one obtained by adding \[AgN{{O}_{3}}\] to slight excess of KI and another obtained by adding KI to slight excess of \[AgN{{O}_{3}}\] are mixed together. Then:
  A)
  the two sols will stabilize each other done clear
  B)
  the sol particles will acquire more electric charge done clear
  C)
  the sols will coagulate each other mutually done clear
  D)
  a true solution will be obtained done clear
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• question_answer35)
  Under the influence of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using \[NaCl,\]\[N{{a}_{2}}S{{O}_{4}}\]  and \[N{{a}_{3}}P{{O}_{4}}\]solutions. Their coagulating values will be in maximum for:
  A)
  \[NaCl\]                         done clear
  B)
  \[N{{a}_{2}}S{{O}_{4}}\] done clear
  C)
  \[N{{a}_{3}}P{{O}_{4}}\]                    done clear
  D)
  same for all done clear
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• question_answer36)
  According to Langmuir adsorption isotherm, the amount of gas adsorbed at very high pressures
  A)
  reaches a constant limiting value done clear
  B)
  goes on increasing with pressure done clear
  C)
  goes on decreasing with pressure done clear
  D)
  increases first and then decreases with pressure done clear
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• question_answer37)
  Under ambient conditions, which among the following surfactants will form micelles in aqueous solution at lowest molar concentration?              
  A)
  \[C{{H}_{3}}-{{(C{{H}_{2}})}_{8}}-CO\overset{-}{\mathop{O}}\,\,N{{a}^{+}}\] done clear
  B)
  \[C{{H}_{3}}{{(C{{H}_{2}})}_{11}}\overset{+}{\mathop{N}}\,{{(C{{H}_{3}})}_{3}}\overset{-}{\mathop{B}}\,r\] done clear
  C)
  \[C{{H}_{3}}-{{(C{{H}_{2}})}_{13}}-OSO_{3}^{-}N{{a}^{+}}\] done clear
  D)
  \[C{{H}_{3}}{{(C{{H}_{2}})}_{15}}\overset{+}{\mathop{N}}\,{{(C{{H}_{3}})}_{3}}\overset{-}{\mathop{B}}\,r\] done clear
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• question_answer38)
  The migration of dispersion medium under the influence of an electric potential is called:
  A)
  Cataphoresis     done clear
  B)
  Electro-osmosis done clear
  C)
  Electrophoresis   done clear
  D)
  Sedimentation done clear
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• question_answer39)
  Flocculation value of \[BaC{{l}_{2}}\] is much less than that of \[KCl\] for sol A and flocculation value of \[N{{a}_{2}}S{{O}_{4}}\] is much less than that of \[NaBr\] for sol B. The correct statement among the following is:
  A)
  Both the sols A and B are negatively charged. done clear
  B)
  Sol A is positively charged and Sol B is negatively charged. done clear
  C)
  Both the sols A and B are positively charged. done clear
  D)
  Sol A is negatively charged and sol B is positively charged. done clear
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• question_answer40)
  Which of the following statements regarding difference between adsorption and absorption is incorrect?
  A)
  Adsorption is a surface whereas absorption is a bulk phenomena. done clear
  B)
  Water vapours are absorbed by anhydrous \[CaC{{l}_{2}}\] but adsorbed by silica gel. done clear
  C)
  Adsorption and absorption take place individually. They can not occur simultaneously. done clear
  D)
  All of the above statements are correct. done clear
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• question_answer41)
  In Langmuir's model of adsorption of a gas on a solid surface
  A)
  the mass of gas striking a given area of surface is proportional to the pressure of the gas done clear
  B)
  the mass of gas striking a given area of surface is independent of the pressure of the gas done clear
  C)
  the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered done clear
  D)
  the adsorption at a single site on the surface may involve multiple molecules at the same time. done clear
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• question_answer42)
  Which one of the following statements is not correct in respect of lyophilic sols?
  A)
  There is a considerable interaction between the dispersed phase and dispersion medium done clear
  B)
  These are quite stable and are not easily coagulated done clear
  C)
  They carry charge done clear
  D)
  The particles are hydrated done clear
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• question_answer43)
  Lyophilic sols are more stable than lyophobic sols because:
  A)
  the colloidal particles have positive charge done clear
  B)
  the colloidal particles have negative charge done clear
  C)
  the colloidal particles are solvated done clear
  D)
  there is strong electrostatic repulsion between the colloidal particles done clear
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• question_answer44)
  Select incorrect statement:
  A)
  Micelles are associated colloids done clear
  B)
  The electrical charge on a colloid particle is indicated by electrophoresis done clear
  C)
  Formation of micelles takes place above Kraft temperature done clear
  D)
  Formation of micelles takes place below CMC done clear
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• question_answer45)
  Point out the false statement
  A)
  Brownian movement and Tyndall effect are shown by colloidal systems. done clear
  B)
  Gold number is a measure of the protective power of a lyophillic colloid done clear
  C)
  The colloidal solution of a liquid in liquid is called gel done clear
  D)
  Hardy - Schuize rule is related with coagulation. done clear
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• question_answer46)
  Which gas will be adsorbed on a solid to greater extent?
  A)
  Having non - polar molecule done clear
  B)
  Having highest critical temperature done clear
  C)
  Having lowest critical temperature done clear
  D)
  Having lowest critical pressure done clear
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• question_answer47)
  Which of the following adsorption isotherms represents the absorption of a gas by a solid involving multilayers of formation? (\[{{P}_{s}}\]=  saturation pressure)
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer48)
  A detergent \[({{C}_{12}}{{H}_{25}}SO_{4}^{-}N{{a}^{+}})\] solution becomes a colloidal sol at a concentration of\[{{10}^{-3}}M\]. Onan average \[{{10}^{13}}\] colloidal particles are present in \[1\text{ }m{{m}^{3}}\]. What is the average number of ions which are contained by one colloidal particle (micelle)?  [Given: \[{{N}_{A}}=6\times {{10}^{23}}mo{{l}^{-1}}\]]
  A)
  \[6\times {{10}^{7}}\]              done clear
  B)
  10 done clear
  C)
  60                                 done clear
  D)
  None of these done clear
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• question_answer49)
  Which of the following is most powerful to coagulate the negative colloid?
  A)
  \[ZnS{{O}_{4}}\]                      done clear
  B)
  \[N{{a}_{3}}P{{O}_{4}}\] done clear
  C)
  \[AlC{{l}_{3}}\]                        done clear
  D)
  \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] done clear
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• question_answer50)
  Coagulation value of the electrolytes \[AlC{{l}_{3}}\] and \[NaCl\] for \[A{{s}_{2}}{{S}_{3}}\] sol are 0.093 and 52 respectively. How many times \[AlC{{l}_{3}}\] has greater coagulating power than\[NaCl\]?
  A)
  930                               done clear
  B)
  520 done clear
  C)
  560                               done clear
  D)
  None of these done clear
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• question_answer51)
  The protecting power of lyophilic colloidal sol is expressed in terms of:
  A)
  coagulation value done clear
  B)
  gold number done clear
  C)
  critical miscelle concentration done clear
  D)
  oxidation number done clear
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• question_answer52)
  Which of the following statements is correct for the spontaneous adsorption of a gas?
  A)
  \[\Delta S\] is negative and, therefore, \[\Delta H\] should behighly positive done clear
  B)
  \[\Delta S\] is negative and therefore, \[\Delta H\] should be highly negative done clear
  C)
  \[\Delta S\] is positive and, therefore, \[\Delta H\] should be negative done clear
  D)
  \[\Delta S\] is positive and therefore, \[\Delta H\] should also be highly positive done clear
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• question_answer53)
  Which property of colloids is not dependent on the charge on colloidal particles?
  A)
  Coagulation      done clear
  B)
  Electrophoresis done clear
  C)
  Electro-osmosis   done clear
  D)
  Tyndall effect done clear
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• question_answer54)
  Smoke is an example of:
  A)
  Solid dispersed in solid done clear
  B)
  Gas dispersed in liquid done clear
  C)
  Solid dispersed in gas done clear
  D)
  Gas dispersed in solid done clear
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• question_answer55)
  On addition of 1 mL of 10% \[NaCl\] solution to 10 mL gold sol in the presence of 0.025 g of starch, the coagulation is just prevented. Starch has gold number
  A)
  2.5                    done clear
  B)
  25     done clear
  C)
  0.25                  done clear
  D)
  0.025 done clear
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• question_answer56)
  Fog is a colloidal solution of
  A)
  solid particles dispersed in gas done clear
  B)
  solid particles dispersed in a liquid done clear
  C)
  liquid particles dispersed in gas done clear
  D)
  gaseous particles dispersed in a liquid done clear
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• question_answer57)
  Select incorrect statement:
  A)
  Soap and detergent lower the interfacial surface tension between oil and water done clear
  B)
  Basic principle of peptization is reverse of coagulation done clear
  C)
  Soap and detergent used as emulsifiers done clear
  D)
  Lyophilic sols need stabilizing agent done clear
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• question_answer58)
  Which of the following is most effective in causing the coagulation of ferric hydroxide sol?
  A)
  KCl done clear
  B)
  \[KN{{O}_{3}}\] done clear
  C)
  \[{{K}_{2}}S{{O}_{4}}\]                      done clear
  D)
  \[{{K}_{3}}[Fe{{(CN)}_{6}}]\] done clear
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• question_answer59)
  Aluminium hydroxide forms a positively charged sol. Which of the following ionic substances should be most effective in coagulating the sol?
  A)
  \[NaCl\]            done clear
  B)
  \[CaC{{l}_{2}}\] done clear
  C)
  \[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}\] done clear
  D)
  \[{{K}_{3}}P{{O}_{4}}\] done clear
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• question_answer60)
  Colloidal gold is prepared by
  A)
  Mechanical dispersion done clear
  B)
  Peptisation done clear
  C)
  Bredig's Arc method done clear
  D)
  Hydrolisis done clear
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• question_answer61)
  Colloid of which one of the following can be prepared by electrical dispersion method as well as reduction method?
  A)
  Sulphur             done clear
  B)
  Ferric hydroxide done clear
  C)
  Arsenious sulphide done clear
  D)
  Gold done clear
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• question_answer62)
  The cause of Brownian movement is
  A)
  Heat changes in liquid state done clear
  B)
  Convectional currents done clear
  C)
  The impact of molecules of the dispersion medium on the colloidal particles. done clear
  D)
  Attractive forces between the colloidal particles and molecules of dispersion medium. done clear
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• question_answer63)
  During adsorption
  A)
  \[T\Delta S\] is positive       done clear
  B)
  \[\Delta H-T\Delta S\] is negative done clear
  C)
  \[\Delta H\] is positive done clear
  D)
  \[T\Delta S\] and \[\Delta G\] become zero done clear
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• question_answer64)
  Which of the following gas molecules have maximum value of enthalpy of physisorption?
  A)
  \[{{C}_{2}}{{H}_{6}}\]                       done clear
  B)
  Ne   done clear
  C)
  \[{{H}_{2}}O\]             done clear
  D)
  \[{{H}_{2}}\] done clear
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• question_answer65)
  Adsorption is accompanied by the evolution of heat. So according to Le-Chatelier principle the amount of substance adsorbed should
  A)
  increase with decrease in temperature done clear
  B)
  increase with increase in temperature done clear
  C)
  decrease with decrease in temperature done clear
  D)
  decrease with increase in temperature done clear
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• question_answer66)
  In Freundlich adsorption isotherm, the value of 1/n is:
  A)
  between 0 and 1 in all cases done clear
  B)
  between 2 and 4 in all cases done clear
  C)
  1 in case of physical adsorption done clear
  D)
  1 in case of chemisorption done clear
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• question_answer67)
  The adsorption of a gas on a solid surface varies with pressure of the gas in which of the following manner.
  A)
  Fast \[\to \] slow \[\to \] independent of the pressure done clear
  B)
  Slow \[\to \] fast \[\to \] independent of the pressure done clear
  C)
  Independent of the pressure \[\to \] fast \[\to \] slow done clear
  D)
  Independent of the pressure \[\to \] slow \[\to \] fast done clear
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• question_answer68)
  Associated colloids:
  A)
  raise both the surface tension and viscosity of water done clear
  B)
  lower both the surface tension and viscosity of water done clear
  C)
  lower the surface tension and raise the viscosity of water done clear
  D)
  have greater concentration at the surface layer than the bulk of the solution done clear
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• question_answer69)
  Hydrolysis of urea is an example of
  A)
  homogeneous catalysis done clear
  B)
  heterogeneous catalysis done clear
  C)
  biochemical catalysis done clear
  D)
  zeolite catalysis done clear
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• question_answer70)
  When \[KCl{{O}_{3}}\] is heated, it decomposes into \[KCl+{{O}_{2}}\]. If some \[Mn{{O}_{2}}\] is added, the reaction goes much faster because
  A)
  \[Mn{{O}_{2}}\] decomposes to give \[{{O}_{2}}\] done clear
  B)
  \[Mn{{O}_{2}}\] provides heat by reacting done clear
  C)
  better contact is provided by \[Mn{{O}_{2}}\] done clear
  D)
  \[Mn{{O}_{2}}\] acts as a catalyst done clear
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