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Which of the following is not a component of the mixture present in the reference cell of Non-dispersive infrared analyzer?

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Which of the following is not a component of the mixture present in the reference cell of Non-dispersive infrared analyzer?

(a) CO

(b) Nitrogen

(c) Water vapour

(d) Hydrogen

I got this question during an online exam.

This key question is from Estimation of Carbon Monoxide in division Pollution Monitoring Instruments of Analytical Instrumentation

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The correct option is (d) Hydrogen

Easy explanation: The reference cell contains a fixed quantity of gases. It contains CO, nitrogen and water vapour.

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