Q. In the conductometric method, the difference in gas conductivity before and after passing sample gas denotes which of the following?

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Q. Conductometric method is not very suitable for measuring traces of which of the following gases in ppb range?

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Q. Polarographic cells are not sensitive to which of the following gases?

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Q. In polarographic cell when potential is applied, oxygen is reduced at __________ when KCl is present.

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Q. Polarographic cells are used to measure the partial pressure of gases only in static gas monitoring systems and not in continuous streams.

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Q. Polarographic cells used for measuring the partial pressure of oxygen are temperature-sensitive.

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Q. Nitrogen dioxide can be detected with a paramagnetic analyser.

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Q. Nitrogen oxide cannot be directly analysed using UV and Visible analyzers due to which of the following reasons?

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Q. How is NO converted to NO₂ for analysis in UV and Visible analyzers?

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Q. How is NO converted to NO₂ for analysis in Chemiluminescent analyser?

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Q. During analysis of NO₂ using Chemiluminescent analyser, why is NO₂ not made to react with ozone directly?

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Q. The instruments based on chemiluminescence maintain linearity in which of the following ranges?

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Q. How can absorption be enhanced while determining NO concentration using CO laser?

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Q. Which of the following detectors are generally used for detection in NO analysis using CO laser?

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Q. Which of the following analyzers are used to measure trace amounts of nitrogen oxides in the stratosphere?

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Q. A pink coloured dye complex is formed when air containing NO₂ is passed in an absorbing solution consisting of __________ and diamine dissolved in the acetic acid medium.

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Q. In Laser Opto-acoustic spectroscopy, the IR beam excites the molecules to higher states. In which of the following ways do the molecules return to the ground state?

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Q. To monitor oxides of nitrogen in stack effluents, the sample containing oxides of nitrogen is passed through a flask containing solution of H₂O₂ in sulphuric acid. Nitric acid is formed. The nitrate ions then react with phenol-disulphonic acid to produce blue colour.

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Q. Which of the following is not an advantage of electrochemical cells used for analysis of H₂S?

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Q. Which of the following methods are mainly used in combustible gas detection equipment?

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