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In liquid membrane electrode, the liquid ion exchanger is held in a porous disc of _____________

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In liquid membrane electrode, the liquid ion exchanger is held in a porous disc of _____________

(a) Solid material

(b) Semi-permeable membrane

(c) Hydrophobic material

(d) Water absorbing material

I had been asked this question in an international level competition.

My enquiry is from Ion Selective Electrodes-Principle and Types in division pH Meters and Ion Analysers of Analytical Instrumentation

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Correct choice is (c) Hydrophobic material

The best explanation: In a liquid membrane electrode, the liquid ion exchanger is held in a porous disc of hydrophobic material. It is water repelling material.

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