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Given below is the diagram of liquid membrane electrode. Identify the unmarked component.

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Given below is the diagram of liquid membrane electrode. Identify the unmarked component.

(a) Solid material

(b) Semi-permeable membrane

(c) Hydrophobic material

(d) Water absorbing material

The question was posed to me during an online interview.

Origin of the question is Ion Selective Electrodes-Principle and Types in section pH Meters and Ion Analysers of Analytical Instrumentation

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Best answer
Right option is (c) Hydrophobic material

The best explanation: The unmarked component is porous hydrophobic material. It holds the liquid ion exchanger.

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