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The zero of the scale is calibrated using which of the following as the sample?

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The zero of the scale is calibrated using which of the following as the sample?

(a) Air

(b) Water

(c) Inert gas

(d) Pure nitrogen

I got this question by my school principal while I was bunking the class.

The above asked question is from Estimation of Carbon Monoxide in section Pollution Monitoring Instruments of Analytical Instrumentation

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Correct answer is (d) Pure nitrogen

Best explanation: The zero of the scale is calibrated using pure nitrogen as the sample. Optical filters are used to minimize the effects of interfering gases.

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