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Chemical Technician (Analytical Chemistry) > Pollution Monitoring Instruments > Flashcards

Pollution Monitoring Instruments Flashcards

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1
Q
  1. In West-Gaeke colourimetric procedure, the intensity of the red purple colour is measured photometically and it is proportional to the concentration of sulphur dioxide. What is the red purple coloured compound?
    a) Sodium tetra chloromercurate
    b) Dicholorosulphitomercurate complex
    c) Ammonia molybdate
    d) Paraosaniline sulphonic acid
A

d) Paraosaniline sulphonic acid

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2
Q
  1. The conductivitimetry method, involves bubbling
    sulphur dioxide through a solution containing sulphuric
    acid and which of the following?
    a) Water
    b) Hydrogen peroxide
    c) Iodine
    d) Formaldehyde
A

b) Hydrogen peroxide

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3
Q
  1. Which of the following is not true about using gas
    chromatography for measuring pollutants in the air?
    a) Pollutants react rapidly in the column
    b) Pollutants may not be detected by the detectors
    c) Special column and support materials are required
    d) Pollutants may elude rapidly from the column
A

d) Pollutants may elude rapidly from the column

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4
Q
  1. Which of the following are not the characteristics of
    conductivitimetry method used to measure sulphur
    dioxide?
    a) Fast response
    b) High sensitivity
    c) Free from interference by other gases
    d) Good accuracy
A

c) Free from interference by other gases

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5
Q
  1. The ability of sulphur dioxide to reduce iodine is used in
    which of the following methods?
    a) Colorimetry
    b) Conductivitimetry
    c) Coulometry
    d) Gas chromatography
A

c) Coulometry

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6
Q
  1. Which of the following are not the characteristics of
    colorimetry method used to monitor sulphur dioxide?
    a) It is simple
    b) It has high sensitivity
    c) It has good specificity
    d) It is affected by interference from H2SO4, SO3, NH3, etc
A

d) It is affected by interference from H2SO4, SO3, NH3, etc

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7
Q
  1. Which of the following materials are used as electrodes
    in the coulometric method for the measurement of
    sulphur dioxide?
    a) Gold
    b) Silver
    c) Platinum
    d) Nicke
A

c) Platinum

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7
Q
  1. Which of the following is the detection limit of the
    coulometric method used for measurement of sulphur
    dioxide?
    a) 0.1 ppm
    b) 1 ppm
    c) 2 ppm
    d) 0.01 ppm
A

d) 0.01 ppm

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8
Q
  1. Sensitivity to total sulphur by Flame-photometric
    detector is which of the following levels?
    a) 0.1 ppm
    b) 1 ppm
    c) 2 ppm
    d) 0.01 ppm
A

d) 0.01 ppm

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9
Q
  1. Which of the following methods are not used for the
    measurement of sulphur dioxide?
    a) Colorimetric method
    b) Correlation spectroscopy
    c) Paramagnetic analyzers
    d) Flame-photometry
A

c) Paramagnetic analyzers

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10
Q
  1. Which of the following is the wavelength of the
    radiation generated when an air stream containing sulphur
    dioxide is burned in a hydrogen-rich flame?
    a) 243 nm
    b) 394 nm
    c) 467 nm
    d) 516 nm
A

b) 394 nm

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11
Q
  1. In conductivitimetric method, the concentration of
    sulphur dioxide is proportional to which of the following
    parameters of the saw-tooth waveform?
    a) Average voltage
    b) Peak voltage
    c) Slope
    d) RMS voltage
A

c) Slope

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12
Q
  1. The response of coulometric method is instantaneous.
    a) True
    b) False
A

b) False

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12
Q
  1. In the conductivitimetric method, to measure the
    conductivity of the cell, 5V ___________ is applied across
    the electrodes.
    a) DC
    b) AC
    c) Pulsating DC
    d) DC or AC
A

b) AC

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13
Q
  1. In Saltzman method, which of the following are formed when air containing NO2 is passed in an absorbing solution consisting of the sulphanilic acid and diamine dissolved in
    the acetic acid medium?
    a) Blue colour dye complex
    b) Green colour dye complex
    c) Pink colour dye complex
    d) Orange colour dye complex
A

c) Pink colour dye complex

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14
Q
  1. NO can be analysed by converting it into NO2 and
    passing it through potassium permanganate. Which of the following is the main disadvantage of this method?
    a) Less accuracy
    b) Dye formed is unstable
    c) Dye formed is colourless
    d) Quantity of dye is low
A

b) Dye formed is unstable

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15
Q
  1. In Jacob-Hochheiser method, NO2 is passed through a
    dilute solution of sodium hydroxide forming the nitrite ion.
    The nitrite ion is reacted with sulphanilamide and ethylene
    diamine in which of the following to form the highly
    coloured azo dye?
    a) Sulphuric acid
    b) Hydrochloric acid
    c) Nitric acid
    d) Phosphoric acid
A

d) Phosphoric acid

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16
Q
  1. Which of the following methods results in the formation
    of yellow coloured compound?
    a) Griess-Saltzman method
    b) Phenoldisul phonoic acid method
    c) Chemiluminescence method
    d) West-Gaeke method
A

b) Phenoldisul phonoic acid method

17
Q
  1. Which of the following is the most common application
    of Chemiluminescence method used for the analysis of
    Nitrogen oxides?
    a) In medical applications
    b) In automotive exhaust gases
    c) In manufacturing processes
    d) In chemical industries
A

b) In automotive exhaust gases

18
Q
  1. Which of the following is the wavelength at which CO
    laser operates?
    a) 1.005 µm
    b) 5.307 µm
    c) 4.952 µm
    d) 6.179 µm
A

b) 5.307 µm

19
Q
  1. CO laser is operated at liquid nitrogen temperature.
    a) True
    b) False
A

a) True

19
Q
  1. The chemiluminescence reactor with ozonator is specific
    to which of the following compounds?
    a) N2
    b) NO
    c) NO2
    d) N2O
A

b) NO

20
Q
  1. In which of the following ways can chemiluminescence occur in compounds of nitrogen?
    a) When NO2 returns to ground state from excited state
    b) When NO reacts with oxygen
    c) When NO reacts with ozone
    d) When NO2 is reduced to NO
A

a) When NO2 returns to ground state from excited state

21
Q
  1. West-Gaeke colorimetric method is used to analyse
    oxides of nitrogen.
    a) True
    b) False
A

b) False

22
Q
  1. Which of the following are not the characteristics of
    Non-dispersive infrared analyzer method?
    a) Easy to maintain
    b) High response speed
    c) Effect of interfering components is high
    d) High sensitivity
A

c) Effect of interfering components is high

22
Q
  1. Which of the following is the full scale range of Infrared
    spectroscopy method used for measurement of carbon
    monoxide?
    a) 0-2 ppm
    b) 0-500 ppm
    c) 0-1 ppm
    d) 0-50 ppm
A

d) 0-50 ppm

23
Q
  1. Which of the following is the full scale range of Gas
    chromatography method used for measurement of carbon
    monoxide?
    a) 0-200 ppm
    b) 0-500 ppm
    c) 0-1 ppm
    d) 0-50 ppm
A

a) 0-200 ppm

24
Q
  1. Non-dispersive infrared analyzer depends on the
    characteristic absorption of the CO molecule at a
    wavelength of __________
    a) 5.4 µm
    b) 4.6 µm
    c) 8.9 µm
    d) 10.8 µm
A

b) 4.6 µm

25
Q
  1. 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
A

d) Pure nitrogen

26
Q
  1. The disadvantage of Non-dispersive infrared analyzer is
    that the effect of flow rate is large.
    a) True
    b) False
A

b) False

27
Q
  1. A stripper column used in gas chromatography, can be used to retain which of the following when an air sample is passed through it?
    a) CO
    b) Methane
    c) Light hydrocarbons
    d) Heavy hydrocarbons
A

d) Heavy hydrocarbons

28
Q
  1. 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
A

d) Hydrogen

29
Q
  1. Hydrogen flame ionization detector can be used to
    detect only the peak of CO and not methane.
    a) True
    b) False
A

b) False

30
Q
  1. CO analyzers based on infrared absorption would give
    greater sensitivity under which of the following
    conditions?
    a) With larger cell path lengths
    b) With smaller cell path lengths
    c) By changing the gases in the reference cell
    d) By increasing the sample flow rate
A

a) With larger cell path lengths

31
Q
  1. Which of the following is the most abundant
    hydrocarbon which is emitted into the atmosphere by
    biological activity?
    a) Ethane
    b) Methane
    c) Poly Aromatic hydrocarbons
    d) Pentane
A

b) Methane

31
Q
  1. Which of the following methods cannot be used for the
    estimation of hydrocarbons?
    a) Mass spectroscopy
    b) Chemiluminescence method
    c) Ultraviolet absorption
    d) Gas chromatography
A

b) Chemiluminescence method

32
Q
  1. Flame ionization detectors are sensitive to which of the
    following gases?
    a) Carbon dioxide
    b) Methane
    c) Carbon monoxide
    d) Sulphur dioxide
A

b) Methane

32
Q
  1. How can carbon monoxide be detected using flame
    ionization detectors while using gas chromatography
    technique?
    a) By converting it into carbon dioxide
    b) By converting it into methane
    c) By mixing it with combustible gases
    d) It cannot be detected
A

b) By converting it into methane

33
Q
  1. Which of the following organic compounds will have the
    highest intensity of response when introduced in a flame
    ionization detector?
    a) Methane
    b) Ethane
    c) Propane
    d) Butane
A

d) Butane

34
Q
  1. Propane would give three times the intensity of
    response as compared to methane.
    a) True
    b) False
A

a) True

35
Q
  1. In flame ionization detectors, which of the following is
    the range adequate for atmospheric sampling?
    a) 0-1 ppm
    b) 0-2 ppm
    c) 0-20 ppm
    d) 0-100 ppm
A

c) 0-20 ppm

36
Q
  1. Which of the following methods make use of pyrolysis
    while used for detecting methane?
    a) Mass spectroscopy
    b) Flame ionization detector
    c) Ultraviolet absorption
    d) Gas chromatography
A

b) Flame ionization detector

37
Q
  1. In flame ionization detector, the ions collected on the
    negatively charged grid are amplified at the high
    impedance amplifier.
    a) True
    b) False
A

b) False

38
Q
  1. Which of the following is not the characteristic of
    flame ionization detector?
    a) Good linearity
    b) Narrow range of concentration
    c) High sensitivity
    d) Fast response
A

b) Narrow range of concentration

Chemical Technician (Analytical Chemistry) (16 decks)

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