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The reference electrodes in combination electrodes are protected against light using which of the following?

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The reference electrodes in combination electrodes are protected against light using which of the following?

(a) Emerald green glass

(b) Ruby red glass

(c) Sapphire blue glass

(d) Pearl white glass

I got this question in examination.

Enquiry is from Combination Electrode in chapter pH Meters and Ion Analysers of Analytical Instrumentation

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The correct choice is (b) Ruby red glass

The explanation is: The reference electrodes in combination electrodes are protected against light using ruby red glass. The ruby red glass absorbs light.

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