Electroanalytical Techniques MCQs

Electroanalytical Techniques – pH Meter, Ion-Selective Electrodes, Conductometry, Potentiometry, and Voltammetry MCQs

Electroanalytical techniques are powerful methods in chemistry used to analyze substances by measuring electrical properties like voltage, current, or charge. These techniques, including potentiometry, voltammetry, and coulometry, provide precise and selective analysis of chemical species. Widely used in research, industry, and environmental monitoring, electroanalytical methods offer high sensitivity and real-time detection.

pH Meter

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

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2. The electrode used in pH measurement is:
   (a) Platinum electrode
   (b) Silver electrode
   (c) Glass electrode
   (d) Copper electrode
   Show Answer Answer: (c) Glass electrode

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3. pH is measured on a scale ranging from:
   (a) 0 to 7
   (b) 0 to 14
   (c) 1 to 10
   (d) -5 to 5
   Show Answer Answer: (b) 0 to 14

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Ion-Selective Electrodes (ISE)

1. Ion-Selective Electrodes (ISE) are used for:
   (a) Measuring pH only
   (b) Specific ion concentration
   (c) Measuring temperature
   (d) Conductivity measurement
   Show Answer Answer: (b) Specific ion concentration

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2. Which ion-selective electrode is used for detecting sodium ions?
   (a) Calcium ISE
   (b) Fluoride ISE
   (c) Sodium ISE
   (d) Silver ISE
   Show Answer Answer: (c) Sodium ISE

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Conductometry

1. Conductometry measures:
   (a) Electrical resistance
   (b) Electrical conductivity of a solution
   (c) Redox reactions
   (d) Light absorption
   Show Answer Answer: (b) Electrical conductivity of a solution

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2. The SI unit of conductivity is:
   (a) Ohm (Ω)
   (b) Siemens per meter (S/m)
   (c) Farad (F)
   (d) Joule (J)
   Show Answer Answer: (b) Siemens per meter (S/m)

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Potentiometry

1. Potentiometry measures:
   (a) Conductance
   (b) Electromotive force (EMF)
   (c) Refractive index
   (d) Light absorbance
   Show Answer Answer: (b) Electromotive force (EMF)

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2. Which of the following is used as a reference electrode?
   (a) Hydrogen electrode
   (b) Silver-silver chloride electrode
   (c) Calomel electrode
   (d) All of the above
   Show Answer Answer: (d) All of the above

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Voltammetry

1. Voltammetry measures:
   (a) Absorbance of light
   (b) Electrical current as a function of applied potential
   (c) Heat change in a reaction
   (d) Conductivity of a solution
   Show Answer Answer: (b) Electrical current as a function of applied potential

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2. Which electrode is commonly used in voltammetry?
   (a) Silver-silver chloride electrode
   (b) Platinum electrode
   (c) Mercury drop electrode
   (d) All of the above
   Show Answer Answer: (d) All of the above

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