Potentiometry MCQ Quiz Questions And Answers

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Potentiometry MCQ Quiz Questions And Answers - Quiz

Potentiometry is a method of electroanalytical chemistry that is used to find concentration of a solute in a solution. Check out this 'Potentiometry MCQ quiz with questions and answers. You should try this quiz and get to test your knowledge on the topic of potentiometry today. Do you think you'll be able to pass this test? Let's start and see how much score you can make. So, are you ready? Good luck!


Questions and Answers
  • 1. 
    The electrolyte solution within the glass electrode (ref) of the pH meter is:
    • A. 

      Saturated KCl

    • B. 

      Concentrated HCl

    • C. 

      Dilute KC1

    • D. 

      Dilute HCl

  • 2. 
    The reaction that occurs in the electrolyte solution of the pCO2 electrode resulting in a change in pH is: 
    • A. 

      CO2 + H20 ----> H2CO3 ----> H+ + HCO3

    • B. 

      H+ + CO3- ----> H2CO3

    • C. 

      H2CO3 ----> H2O + CO2

    • D. 

      CO2 + H2O -----> 2H+ + CO3

  • 3. 
    Which of the following is NOT associated with a pCO2 electrode:?
    • A. 

      Membrane permeable to CO2

    • B. 

      PH electrode

    • C. 

      Measurement is amperometric

    • D. 

      Measurement is potentiometric

  • 4. 
    Electrodes made of pH sensitive glass may be used in the analysis of:
    • A. 

      PCO2

    • B. 

      PO2

    • C. 

      PH

    • D. 

      (a) and (c) are correct

    • E. 

      None of the above

  • 5. 
    The EMF of the sample cell is determined by which of the following formulas: 
    • A. 

      Ecell = Ecathode + Elj - Eanode

    • B. 

      Ecell = Eanode - Elj - Ecathode

    • C. 

      Ecell = Ecathode - Elj - Eanode

    • D. 

      Ecell = Eanode + Elj - Ecathode

  • 6. 
    In potentiometry, which of the following is considered the standard electrode?
    • A. 

      Calcium electrode

    • B. 

      Hydrogen electrode

    • C. 

      Potassium electrode

    • D. 

      Copper electrode

  • 7. 
    In an electrolytic cell, which of the following is the half-cell where reduction takes place?
    • A. 

      Anode

    • B. 

      Cathode

    • C. 

      Combination electrode

    • D. 

      Electrode response

  • 8. 
    Mercury covered by a layer of mercurous chloride in contact with saturated potassium chloride solution is a description of which of the following types of electrodes?
    • A. 

      Sodium

    • B. 

      Calcium

    • C. 

      Silver/silver chloride

    • D. 

      Calomel

  • 9. 
    Combination electrodes refers to which of the following?
    • A. 

      Reference and testing electrodes are assigned to different compartments closely linked

    • B. 

      Reduction takes place at the anode

    • C. 

      The testing electrode and reference are contained within a single unit

    • D. 

      The calomel electrode is a good example of a combination electrode

  • 10. 
    A pH/Blood gas analyzer contains a pH sensitive:
    • A. 

      Glass electrode which consists of silicon dioxide, sodium oxide, and aluminon oxide

    • B. 

      Electrode surface consisting of a polypropylene membrane permeable to H+

    • C. 

      Electrode surface consisting of a polypropylene membrane permeable to H2CO3/CO2

    • D. 

      Glass electrode which is permeable to H+

  • 11. 
    Monitoring the current at an electrolytic electrochemical cell that is generated at a fixed voltage and is proportional to the concentration of analyte present in the test sample in solution is referred to as:
    • A. 

      Coulometry

    • B. 

      Potentiometry

    • C. 

      Osmometry

    • D. 

      Amperometry

  • 12. 
    Incorporation of ____, into a polyvinyl chloride membrane allows for the manufacture of an ion-selective electrode that is highly selective for calcium. 
    • A. 

      Di-p-octylphenyl phosphate

    • B. 

      Nonactin

    • C. 

      Valinomycin

    • D. 

      Erythromycin

  • 13. 
    Which one of the following is used both as an internal reference element in potentiometric ion-specific electrodes and as an external reference electrode half-cell of constant potential required to complete a potentiometric cell?
    • A. 

      Calomel

    • B. 

      Mercury vapour

    • C. 

      Silver/silver chloride

    • D. 

      Platinum

  • 14. 
    Which of the following conditions are among the requirements for a Nernst equilibrium potential to exist for a given charged ion species across a semipermeable membrane, as in an ion-selective electrode?
    • A. 

      The semipermeable membrane must be permeable to many ion species

    • B. 

      A concentration gradient for a given charged ion species must exist across that membrane.

    • C. 

      If a membrane is permeable to two different ion species, then the ion activity of both species can be measured.

    • D. 

      The membrane potential across a semipermeable membrane must be constantly changing.

  • 15. 
    The reference potential of a silver-silver chloride electrode is determined by the: 
    • A. 

      Concentration of potassium chloride filling solution

    • B. 

      Surface area of the electrode

    • C. 

      Activity of total anion in the paste covering electrode

    • D. 

      Concentration of silver in the paste covering electrode

  • 16. 
    Ion-selective analyzers using undiluted samples have what advantage over analyzers that use diluted sample?
    • A. 

      They can measure over a wider range of concentration

    • B. 

      They are not subject to pseudohyponatremia caused by high lipids or high proteins

    • C. 

      They do not require temperature equilibration

    • D. 

      They require less maintenance

  • 17. 
    The ability of an indicator (measuring) electrode to respond to a single species of ion and not any other is referred to as:
    • A. 

      Sensitivity

    • B. 

      Accuracy

    • C. 

      Precision

    • D. 

      Selectivity

  • 18. 
    Of the following half cell reactions, identify the oxidation reactions: 
    • A. 

      Zn ---> Zn 2+ + 2e-

    • B. 

      Cu2+ + 2 e- ----> Cu

    • C. 

      2H + 2 e- ----> H2

    • D. 

      Al ----> Al3+ + 3e-

    • E. 

      Only a and d

    • F. 

      Only b and c

  • 19. 
    What is the correct order of migration towards the anode of the following proteins in serum protein electrophoresis: fibrinogen, albumin, IgD, transferrin, haptoglobin?
    • A. 

      Fibrinogen, IgD, Haptoglobin, Transferrin, Albumin

    • B. 

      Fibrinogen, IgD, Transferrin, Haptoglobin, Albumin

    • C. 

      IgD, Fibrinogen, Transferrin, Haptoglobin, Albumin

  • 20. 
    Immunofixation electrophoresis
    • A. 

      Combines the techniques of zone electrophoresis, isotachophoresis, isoelectric focusing, and gel electrophoresis in small-bore fused silica capillary tubes.

    • B. 

      Involves exposure of electrophoresed proteins to antisera against different immunoglobulin heavy and light chains with resultant precipitation.

    • C. 

      Involves transfer of separated proteins to a strip of nitrocellulose by electroblotting followed by an immunochemical reaction with a specific antibody.

    • D. 

      Uses electrophoresis in two dimensions to assess global changes in protein expresssion.

  • 21. 
    On a serum protein electrophoresis, if the albumin band appears distorted and large, the likely cause is: 
    • A. 

      PH of electrophoretic buffer incorrect

    • B. 

      Instrument not connected

    • C. 

      Sample overload

    • D. 

      Inappropriate support material used

  • 22. 
    If an electrophoretic buffer were diluted before use instead of using it at normal strength, how would electrophoresis be affected?
    • A. 

      Increased migration rate of protein

    • B. 

      Decreased migration rate of protein

    • C. 

      No change in the rate of migration of protein

    • D. 

      None of the above

  • 23. 
    Upon receiving a serum sample for protein electrophoresis, which you perform using agarose gel. You note that the specimen is hemolyzed. How would hemolysis affect the banding pattern of this type of electrophoresis?
    • A. 

      There would be an increased alpha1-globulin band

    • B. 

      There would be a decreased beta-globulin band

    • C. 

      There would be an increase in the gamma globulin bands

    • D. 

      A decreased alpha2-globulin band

  • 24. 
    How does the new charge of the proteins in a sample affect the electrophoretic mobility of protein fractions?
    • A. 

      It is inversely proportional to electrophoretic mobility

    • B. 

      It is directly proportional to electrophoretic mobility

    • C. 

      It is equal to the electrophoretic mobility

    • D. 

      There is no relationship between net charge and electrophoretic mobility

  • 25. 
    What would the concentration of albumin be if the total protein value was 85 g/dL and the densitometer measured the albumin fraction to be 55% of the total, what is the albumin concentration?
    • A. 

      Albumin values cannot be calculated using densitometry

    • B. 

      15.4 g/dL

    • C. 

      0.65 g/dL

    • D. 

      46.8 g/dL

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