__________ are analysed using a polarograph.
A. Isotonic solutions
B. Solids
C. Liquids
D. Gases
Answer: Option B
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Phase lag of the frequency response of a second order system to a sinusoidal forcing function
A. Is 30°
B. Is 90° at the most
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Which of the following is not classified as a thermo electric pyrometer?
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B. Thermocouple
C. Optical pyrometer (disappearing filament type)
D. Radiation pyrometer
A. Chromel-alumel
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The correct answer is: C. Liquids
✅ Explanation:
Polarography is an electrochemical method used to analyze electroactive substances in solution. It involves:
A dropping mercury electrode (DME) as the working electrode.
Measuring current as a function of applied voltage.
The analyte must be dissolved in a liquid electrolyte, making liquid solutions the correct medium.
Option Analysis:
A. Isotonic solutions – These are specific types of liquid solutions but not all solutions analyzed by polarography are isotonic.
❌ Too narrow in scope.
B. Solids – Not analyzable directly; must be dissolved into a solution first.
❌ Incorrect.
C. Liquids – ✅ Correct. Polarographic analysis is performed on liquid solutions containing the analyte.
D. Gases – Can only be analyzed after being dissolved in a liquid.
❌ Not directly analyzed in gas form.
✅ Final Answer: C. Liquids