Analytical Instrumentation Questions and Answers – Ammonia and Fluoride Electrode

This set of Analytical Instrumentation Multiple Choice Questions & Answers (MCQs) focuses on “Ammonia and Fluoride Electrode”.

1. In Ammonia electrode, diffusion of dissolved ammonia occurs through the membrane until which of the following conditions occur?
a) Concentration becomes equal on both sides
b) Activity becomes equal on both sides
c) Partial pressure becomes equal on both sides
d) Differential pressure is low
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2. When electrode potential response is plotted as a function of ammonia concentration on a semi-log graph, the graph obtained will be ____________
a) A straight line
b) Parabolic
c) Sigmoidal
d) A curve
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3. How can samples above 1M in ammonia concentration be measured using ammonia electrode?
a) It must be diluted and measured
b) It cannot be measured
c) The electrode has to be modified for measuring
d) It can be measured directly
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4. The dilution of solution must not reduce the level of ammonia below _________
a) 10^-2 M
b) 10^-5 M
c) 10^-8 M
d) 10^-9 M
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5. Which of the following factors does not the reproducibility of the ammonia electrode?
a) Temperature
b) Drift
c) Noise
d) Dilution
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6. The performance of ammonia electrode is not affected by sample colour and turbidity.
a) True
b) False
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7. In fluoride ion electrode, the potential corresponding to level of the fluoride ion is described by which of the following equations when E is the measured electrode potential, E_o is the reference potential and A is the level of fluoride ions in solution?
a) E=E_o+0.0591 log A
b) E=E_o-0.0591 log A
c) E=E_o+0.0896 log A
d) E=E_o-0.0896 log A
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8. What does TISAB which is used to overcome interferences stand for?
a) Total Isolation Strength Absolute Buffer
b) Total Ionic Strength Absolute Buffer
c) Total Ionic Strength Adjustment Buffer
d) Total Isolation Strength Adjustment Buffer
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9. Which of the following causes main interference in Fluoride electrode?
a) H⁺ ions
b) OH^– ions
c) Li⁺ ions
d) Cl^– ions
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10. Crystal membrane of ion selective electrode can be regenerated by washing with which of the following?
a) Alcohol
b) Iodine solution
c) Acidic solution
d) Basic solution
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11. For fluoride electrode, the electrode response curve will not only shift but will change slope with changes in temperature.
a) True
b) False
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Sanfoundry Global Education & Learning Series – Analytical Instrumentation.

To practice all areas of Analytical Instrumentation, here is complete set of 1000+ Multiple Choice Questions and Answers.