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Biocatalytic membrane electrode cannot be used for the measurement of which of the following gases?

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Biocatalytic membrane electrode cannot be used for the measurement of which of the following gases?

(a) Ammonia

(b) Carbon dioxide

(c) Hydrogen

(d) Nitrogen

The question was asked during an interview for a job.

This is a very interesting question from Special Designs of Ion Selective Electrodes topic in section pH Meters and Ion Analysers of Analytical Instrumentation

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Correct option is (d) Nitrogen

The explanation: Biocatalytic membranes cannot be used for the measurement of nitrogen. It can be used for the measurement of other three gases.

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