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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Q. Which of the following is not an advantage of solid state sensor used for analysis of H₂S?

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Q. Which is the compound that forms the stain in Lead Acetate Tape Staining method used for the analysis of Hydrogen Sulphide and what is the colour of the stain?

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Q. Which of the following methods is not used for detection of hydrogen sulphide?

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Q. In solid state sensor, when heated to 150° to 300° which of the following occurs?

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Q. In the gold film sensor, the change in resistance is proportional to the concentration of H₂S.

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Q. Which of the following occurs in Electrochemical cells used for the detection of hydrogen sulphide?

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Q. Which of the following is not a component of solid state sensor used for detection of hydrogen sulphide?

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Q. Which of the following is not a detector used in mid Infrared Spectrophotometer?

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Q. Why is the use of infrared analyzers limited when it comes to the analysis of inorganic compounds?

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Q. Which of the following is the chopping frequency used for industrial analyzers in the simple infrared analyser for gas analysis?

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Q. Which of the following is used as a source in the simple infrared analyzer for gas analysis?

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Q. Vibration excitation occurs only if the sample has hetero-atomic molecules.

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Q. Which of the following is the chopping frequency used for medical applications in simple infrared analyser for gas analysis?

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Q. The movement of diaphragm in simple infrared analyser for gas analysis results in which of the following?

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