Electroanalytical Techniques MCQs: pH Meter & Ion-Selective Electrodes

Electroanalytical Techniques – pH Meter & Ion-Selective Electrodes MCQs

Test your knowledge of electroanalytical techniques with MCQs covering pH meters and ion-selective electrodes. These instruments are essential for measuring ion concentrations in solutions with high accuracy. Perfect for students, researchers, and exam preparation, these MCQs enhance your understanding of analytical chemistry.

pH Meter

1. The pH meter is used to measure:
   (a) Conductivity of a solution
   (b) Hydrogen ion concentration
   (c) Redox potential
   (d) Temperature of a solution
   Show Answer Answer: (b) Hydrogen ion concentration

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2. Which type of electrode is used in a pH meter?
   (a) Platinum electrode
   (b) Silver electrode
   (c) Glass electrode
   (d) Copper electrode
   Show Answer Answer: (c) Glass electrode

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3. The working principle of a pH meter is based on:
   (a) Conductometry
   (b) Potentiometry
   (c) Spectrophotometry
   (d) Fluorometry
   Show Answer Answer: (b) Potentiometry

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4. Which solution is used for calibrating a pH meter?
   (a) Standard buffer solution
   (b) Distilled water
   (c) Acid solution
   (d) Salt solution
   Show Answer Answer: (a) Standard buffer solution

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5. The pH scale ranges from:
   (a) 1 to 7
   (b) 0 to 10
   (c) 0 to 14
   (d) -5 to 5
   Show Answer Answer: (c) 0 to 14

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6. The pH value of a neutral solution at 25°C is:
   (a) 0
   (b) 7
   (c) 10
   (d) 14
   Show Answer Answer: (b) 7

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7. The potential difference in a pH electrode is generated by:
   (a) Electron transfer
   (b) Ion exchange
   (c) Pressure change
   (d) Conductivity variation
   Show Answer Answer: (b) Ion exchange

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Ion-Selective Electrodes (ISE)

8. Ion-Selective Electrodes (ISE) are used to measure:
   (a) Temperature
   (b) Specific ion concentration
   (c) Total dissolved solids
   (d) Light intensity
   Show Answer Answer: (b) Specific ion concentration

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9. The most common ion-selective electrode is used for detecting:
   (a) Chlorine
   (b) Sodium
   (c) Calcium
   (d) Potassium
   Show Answer Answer: (b) Sodium

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10. Ion-selective electrodes work on the principle of:
    (a) Spectrophotometry
    (b) Conductometry
    (c) Potentiometry
    (d) Fluorometry
    Show Answer Answer: (c) Potentiometry

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11. Which of the following is a key component in an ion-selective electrode?
    (a) Membrane
    (b) Fiber optics
    (c) Thermocouple
    (d) Platinum wire
    Show Answer Answer: (a) Membrane

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12. Ion-selective electrodes respond selectively to:
    (a) Organic molecules
    (b) Specific ions in solution
    (c) Magnetic fields
    (d) UV radiation
    Show Answer Answer: (b) Specific ions in solution

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13. The fluoride ion-selective electrode is commonly used in:
    (a) Environmental water testing
    (b) Food preservation
    (c) Nuclear chemistry
    (d) Gas analysis
    Show Answer Answer: (a) Environmental water testing

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