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University of Mumbai
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Chemistry: Analytical Chemistry (6 Units)
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Subject (Paper Code) : 88648
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1__________ is generally used as a supporting electrolyte in polarography.KClNaOHHClKOHAnswer111Unit1MCQ
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2In polarographic analysis, in presence of oxygen, a second wave is due to the reduction of hydrogen peroxide to …...... at DME at about -0.9 V vs SCE.WaterOxygen radicalHydrochloric acidOzoneAnswer121Unit1MCQ
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3….......is used as a maxima suppressor in Polarography.KBrKCIPhenolphthaleinTriton-X-100Answer411Unit1MCQ
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Value
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4______ one is not a reference electrode.Silver-silver chloride Calomel Rotating platinum electrodeStandard hydrogen electrodeAnswer311Unit1MCQBasic1
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5The electrode which has its own potential and cannot take up potential applied on it is called ___________.Polarizable electrodeDMERotating platinum electrodeNon-polarizable electrodeAnswer411Unit1MCQ
Moderate
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6Half wave potential is defined as potential at which current flowing through the cell is half of ___________Limiting currentResidual current Diffusion currentNon faradaic currentAnswer321Unit1MCQHard3
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7In polarography,__________ is characteristic of the metal ion reduced at the DME.Concentration gradientHalf wave potentialMassTemperatureAnswer221Unit1MCQDifficult
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8Gelatin is added in polarographic analysis _____________.To remove dissolved oxygenTo remove hydrogenAs a maxima suppressorTo facilitate oxidationAnswer321Unit1MCQ
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9A polarogram is a plot of…..........Current versus timeCurrent versus temperatureCurrent versus applied potentialCurrent versus concentrationAnswer311Unit1MCQ
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10The maximum quantity of current passing through the polarographic cell when the electrode becomes concentration polarized is called as…......Faradic currentLimiting current Residual currentMigration currentAnswer211Unit1MCQMarks
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11The fluctuations in polarographic wave is due to the ________.Growth and fall of mercury dropSupporting electrolyte Presence of nitrogenKClAnswer121Unit1MCQRange 1
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12The concentration of supporting electrolyte used in polarography must be…........times of the experimental analyte.100010010500Answer211Unit1MCQNotes
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13In DME when the drop get detached the current becomes _________MaximumZeroMinimum OneAnswer221Unit1MCQ
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14In polarography, passing of an inert gas is necessary prior to measurement in order to remove dissolved…......Hydrogen gasChlorine gasBromine gasOxygen gasAnswer411Unit1MCQ
2. Keep otion field blank if 4th/5th options not available
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15 Magnitude of diffusion current can be expressed in terms of….........Wave height Wave length Wave breadthWavefrontAnswer111Unit1MCQ
3. for Ture false type questions keep 3rd to 5th options blank
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16The diffusion current in polarographic analysis is proportional to the concentration of…....GelatineKCIReducible ionsOxidiziable ionsAnswer321Unit1MCQ
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17Diffusion current = Residual current – limiting currentLimiting current – migration currentLimiting current – residual currentMigration current – residual currentAnswer321Unit1MCQ
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18In polarography __________ is measured.PotentialConductancepHDiffusion currentAnswer411Unit1MCQ
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19The half-wave potential is…..........the concentration of electroactive species.directly proportional toIndependent of Square root of Inversely proportional to Answer211Unit1MCQ
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20Polarographic maxima is due to the ___________.High currentLow potentialAdsorption of dissolved substance on the surface of mercuryAbsorption of dissolved impurityAnswer321Unit1MCQ
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21In Ilkovic Equation, D is _________.DensityDrop timeDiffusion coefficientDissociation ConstantAnswer321Unit1MCQ
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22All of the following are the advantages of dropping mercury electrode, except--------.Constant renewal of electrode surfaceMany metals dissolves in mercury forms an amalgamIn the detection of species having reduction potential more than + 0.5 VDiffusion current assumes a steady state value after each change of applied voltageAnswer 331Unit1MCQ
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23The polarizable electrode used in polarography is __________.Calomel ElectrodeDropping mercury electrodeStandard hydrogen electrodeGlass electrodeAnswer211Unit1MCQ
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24All of the following are the limitations of dropping mercury electrode, except--------Mercury must be highly pureMercury can air oxidize and oxide can clog the capillary tubemercury is highly toxicConstant renewal of electrode surfaceAnswer431Unit1MCQ
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25DME can be used over a voltage range of ___________with reference to SCE. +2 volt to -0. 4 volt +1.4 volt to -2.0 volt + 0.4 volt to -2.0 volt -1.4 volt to -2.0 voltAnswer321Unit1MCQ
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26The drop time of mercury in dropping mercury electrode can be adjusted -------------100-200 sec3-6 sec50-70 sec200-300 secAnswer221Unit1MCQ
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27Polarographic maxima can be suppressed by adding ------Supporting electrolyte Surface active materials Inert gas like nitrogen MercuryAnswer221Unit1MCQ
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28In the polarographic cell, two arms are separated by an agar-agar gel saturated with…............NaClKBrKClKIAnswer311Unit1MCQ
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29The current due to concentration gradient of electroactive species in polarography is called _____.Residual currentFaradaic current Migration currentDiffusion currentAnswer421Unit1MCQ
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30In Ilkovic equation, t is _________.DensityDrop timeDiffusion coefficientMigration timeAnswer221Unit1MCQ
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31The basis of qualitative analysis in polarography is-------Residual current limiting current diffusion currenthalf wave potentialAnswer421Unit1MCQ
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32In polarography, the mercury drop is released from the capillary by________.Pneumatic pumpConstant pressure pumpReciprocationg pumpGravityAnswer421Unit1MCQ
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33The polarographic analysis is applicable to….............. systems.Only oragnic Only inorganicBoth organic and inorganicOnly gaseous Answer321Unit1MCQ
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34DME does not function properly in the presence of ___________Strong oxidizing agentsStrong reducing agentsAcidic conditionsBasic conditionsAnswer111Unit1MCQ
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35The diffusion of particles from bulk of the solution to the surface of DME due to the difference in concentration is called…….....Concentration gradientDecomposition potentialHalf wave potentialElectrical potential gradientAnswer111Unit1MCQ
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36In polarogarphy, oxygen dissolved in the electrolytic solution is reduced at the DME produces polarogram consisting of…........waves.1527Answer311Unit1MCQ
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37Determine the diffusion current for Nickel (II) solution, if diffusion coefficient (D) for Nickel having concentration of 1 mM is 0.69 x 10­­­­¯⁵ cm² s¯¹, flow rate of mercury is 2 mg s¯¹ and drop time is 5 s.3.31 μA6.61 μA31.7 μA18.01 μAAnswer231Unit1MCQ
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38In the polarographic analysis in presence of oxygen, the first wave is due to the reduction of oxygen to …...... at DME at -0.1 V vs SCE.WaterHydrogen peroxideOxygen radicalOzoneAnswer221Unit1MCQ
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39….......... is a branch of voltammetry involving the study of the current-voltage relationship obtained during electrolysis using DME.ConductometryPolarographypH-metryPotentiometryAnswer211Unit1MCQ
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40In polarography, polarizable electrode is also called as ________Macro electrode Gas electrodeAnodeMicro electrode Answer411Unit1MCQ
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41The diffusion current in the polarography depend on all of the following except______Rate of flow of mercury from the capillaryLife time of mercury dropGel electrolyteNumber of electrons involved in the reduction processAnswer321Unit1MCQ
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42In polarography, a series of reducible species in a solution can be estimated, provided their half wave potentials differ by at least….......V.1 V0.1 V0.5 V0.2 VAnswer431Unit1MCQ
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43________ equation forms the basis of quantitative analysis in polarography.FaradyIlkovicNernstKohlrausch'sAnswer211Unit1MCQ
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44In polarography, KCl is used to __________ migration current.MaintainRiseEliminateIncreaseAnswer321Unit1MCQ
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45The indifferent electrolyte present in large concentration in the polarographic cell is known as the…........Supporting electrolyte Gel electrolyteDry polymer electrolyteSolid ceramic electrolyteAnswer111Unit1MCQ
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46In polarography, the conditions are so maintained that movement of ions to DME is controlled by…......Potential gradient Concentration gradientBoth potential and concentration gradientOsmotic pressureAnswer221Unit1MCQ
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47All of the following are the methods used for quantitative polarographic analysis except,….......method.Calibration curveInternal standard Standard additionIsotope dilutionAnswer411Unit1MCQ
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48The supporting electrolytes used in polarography are generally salts of …........metals.RadioactiveTransitionAlkaliPost-transitionAnswer311Unit1MCQ
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49The non-polarizable electrode used in polarography is __________.Quinhydrone electrodeDropping Mercury Electrode (DME)Rotating platinum electrodeCalomel ElectrodeAnswer411Unit1MCQ
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50Amperometric titration is generally used in______.Precipitation titrationPhotometric titrationElectrogravimetryThermal analysisAnswer111Unit1MCQ
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51In Amperometric titration,….......... reagent is used for estimation of chloride, bromide, and iodide ions. Oxine DMGSilver nitrateEDTAAnswer311Unit1MCQ
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52A rotating platinum electrode is generally used in_____.PotentiometryPolarographyAmperometrypH metryAnswer311Unit1MCQ
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53In amperometric titration to find equivalence point, graph is plotted between…..................... Diffusion Current against volume of titrant addedCurrent against applied voltageConductance against volume of titrant addedApplied potential against the volume of titrant addedAnswer121Unit1MCQ
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54When titrant is reducible but titrand and the product is not in amperometric titration shows …........Constant current till the equivalence point, then increasesDecrease in current till the equivalence point, then increasesIncrease in current till the equivalence point, then decreasesConstant current till the equivalence point, then decreasesAnswer111Unit1MCQ
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55The rotating platinum electrode (RPE) rotated at a constant speed of about …....r.p.m.6000250060010000Answer321Unit1MCQ
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56Rotating platinum electrodes (RPE) are used at positive potential upto_______V.1.7-0.9-0.70.9Answer421Unit1MCQ
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57When titrand is reducible but titrant and product are not in amperometric titration shows ….......Constant current till the equivalence point, then increasesDecrease in current till the equivalence point, then constantIncrease in current till the equivalence point, then decreasesConstant current till the equivalence point, then decreasesAnswer221Unit1MCQ
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58In amperometric titration of Pb(II) with chromate ions gives …….....shape of the curve.VSigmoidStraight line passing through originSAnswer111Unit1MCQ
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59In Amperometric titration of Mg (II) determined by titrating with ______.Potassium PermanganateSilver chloridePotassium sulphateOxine reagentAnswer411Unit1MCQ
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60In Amperometry, measurement of current is carried out at …..........as a function of concentration. Increasing applied potentialFixed applied potentialDecreasing applied potentialDecrease and then increase of applied potentialAnswer221Unit1MCQ
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61All of the following are the advantages of Amperometric titrations except, …........Method is accurateCharacteristics of capillary is less importantApplicable to redox titrationsApplicable to thermometric titrationsAnswer411Unit1MCQ
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62In Rotating platinum electrode the diffusion current is _________ times larger than in case of DME.100504020Answer421Unit1MCQ
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63The mechanism of separation in gas - liquid chromatography is ----
differential adsorption
partitionretention differential absorptionAnswer 221Unit 2MCQ
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64In GC the rate at which a solute will move over the stationary phase will depend on the magnitude of ----
distribution coefficient
density of solutecolumn type of detector Answer 111Unit 2MCQ
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65The time taken by the solute to move over the stationary phase and to come out of the column is defined as------ retention volume drop timeretention timedetection timeAnswer 321Unit 2MCQ
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66Retention volume is defined as the volume of _________ required to elute the solute from the column. stationary phasemobile phaseinert solid support baseAnswer 211Unit 2MCQ
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67Retention Time depends on _________
material of which the column is made up of
shape of the column
Length Of the Column
colour of the columnAnswer 311Unit 2MCQ
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68The resolution depends on ------retention time of one solutes retention time of two solutes and width of two peaks width of two peaksretention volume of two solutes and width of one peakAnswer 221Unit 2MCQ
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69________ is the ratio of retention times of the two solutes.Relative retentionSeperation Factor Resolutiondistribution Coefficient Answer 211Unit 2MCQ
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70When the number of therotical plates of a column is larger, the ______ is the efficiency of the column.lesser similar moreminimumAnswer 321Unit 2MCQ
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71The contribution from non equal path of the molecules of the solute leading to broadening of the peak is called -------Eddy diffusion
Longitudinal diffusion
mass transferpath lengthAnswer 121Unit 2MCQ
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72The band broadening due to diffusion within the band is known as---- Eddy diffusion
Longitudinal diffusion
mass transferpath lengthAnswer 221Unit 2MCQ
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73______ is responsible for the movement of the sample along the column in gas chromatography.Solid support DetectorCarrier gas ThermostatAnswer 311Unit 2MCQ
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74Gas chromatography is useful only if the sample components are _______at the column temperature.volatile Non volatileLiquid solid Answer 111Unit 2MCQ
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75If a component A is more soluble in the stationary phase than component B, then A will come out of the column_______ than B EarlierLaterWill not come outBoth A and B will come out at the same timeAnswer 211Unit 2MCQ
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76The mechanism of separation in gas - solid chromatography is ---
differential adsorption
partitionretention differential absorptionAnswer 121Unit 2MCQ
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77The following detector is not used in gas chromatography----TCDFIDECDPMT Answer 411Unit 2MCQ
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78HETP depends on --- Length of the column
  Nature of the solute
    Mobile phaseColour of the columnAnswer 111Unit 2MCQ
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79For Thermal Conductivity detector the carrier gas of choice is ________xenonnitrogenheliumoxygen Answer 321Unit 2MCQ
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80Thermal conductivity detector is also called as -----Thermogram Katharometer PhotodetectorhologramAnswer 221Unit 2MCQ
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81Flame ionization detector is used for----water vapouronly metalsinorganic compoundsOrganic compoundsAnswer 411Unit 2MCQ
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82In electron capture detector _______ source ionizes pure carrier gas to produce ions and electrons. alpha raybeta raygamma rayx rayAnswer 221Unit 2MCQ
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83________ level of concentration of toxic organic compound can be determined using Gas Chromatography.MiligramgramppbppmAnswer 311Unit 2MCQ
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84_________ is the commonly used solid support material to packed column in gas chromatography.GlassMetal Diatomaceous earthWoodAnswer 311Unit 2MCQ
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85In gas – solid chromatography the stationary phase is -----glassliquidsoild woolAnswer 311Unit 2MCQ
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86Capillary columns are open tubular columns constructed from ______ materials.fused silicaalloygelwoodAnswer 111Unit 2MCQ
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87Molecular sieves are used as _________ in gas- solid chromatography.coating materialadsorbentadsorbateheating materialAnswer 211Unit 2MCQ
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88In TCD changes in thermal conductivity of the carrier gas is measured by the ----.TransistorRegulator ThermistorResistorAnswer 311Unit 2MCQ
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89In quantitative measurement by GC _____ parameter is used.Retention timeRetention volumeArea under the peakRelative retentionAnswer 311Unit 2MCQ
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90Quantitative measure of a column's ability to separate two solutes is calledRetentionResolutionfiltrationconcentrationAnswer 211Unit 2MCQ
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91The temperature of operation in GLC depends on ------of sample componentconcentrationfreezing pointboiling pointvolumeAnswer 311Unit 2MCQ
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92Mobile phase used in GC is ----gassolidLiquid alloyAnswer 111Unit 2MCQ
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93The retention time of the mobile phase is called -----ratiodead timecapacityfraction Answer 221Unit 2MCQ
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94The gaseous mobile phase must be chemically -----activereactiveinertimpureAnswer 311Unit 2MCQ