Question

Beckman coulter gel filled combination electrodes provide which of the following features to overcome various problems that occur in gel filled electrodes?

(a) Filters

(b) Semi-permeable membrane

(c) Gas-permeable membrane

(d) Micro-pore junction

This question was addressed to me during an interview for a job.

The doubt is from Combination Electrode in division pH Meters and Ion Analysers of Analytical Instrumentation

Answer 1

Correct choice is (d) Micro-pore junction

The explanation is: Beckman coulter gel filled combination electrode provides a special micro-pore junction to overcome various problems that occur in gel filled electrodes. Here, there is direct contact between the sample and the gel.