Question

Match List-I (Pollutant) with List-II (Method of Measurement)
 

List-I (Pollutant)	List-II (Method of Measurement)
A. O\(_3\)	I. Flame Photometry
B. SO\(_2\)	II. Gas Chromatograph
C. Pb	III. UV Spectrometer
D. Hydrocarbons	IV. Atomic absorption analysis

• A. A-III, B-I, C-IV, D-II
• B. A-I, B-III, C-IV, D-II
• C. A-II, B-I, C-III, D-IV
• D. A-III, B-II, C-IV, D-I

Hint:

Memory aid for pollutant measurement methods:
• O\(_3\) \(\to\) UV Spectrometer (ozone is the UV shield -- naturally linked to UV)
• SO\(_2\) \(\to\) Flame Photometry (sulphur burns with characteristic glow)
• Pb \(\to\) Atomic Absorption (standard technique for all heavy metals)
• Hydrocarbons \(\to\) Gas Chromatography (volatile organics separated by GC)

Answer 1

The Correct Option is A

Concept: Standard instrumental methods are used to measure specific air pollutants based on their physical and chemical properties:
• UV Spectrometry: Ozone (O\(_3\)) strongly absorbs UV radiation at 254 nm; this property is used for its precise measurement.
• Flame Photometry: SO\(_2\) and other sulphur compounds emit characteristic light when burned in a hydrogen-rich flame.
• Atomic Absorption Spectroscopy (AAS): Used for heavy metals like lead (Pb); each metal absorbs light at a specific wavelength.
• Gas Chromatography (GC): Separates and identifies volatile hydrocarbons and organic compounds.

Step 1: Match O\(_3\) with its method.
Ozone absorbs strongly in the UV region; hence measured by UV Spectrometer. \[ \text{A. O}_3 \;\longrightarrow\; \text{III. UV Spectrometer} \]

Step 2: Match SO\(_2\) with its method.
Sulphur compounds emit characteristic radiation in a flame; measured by Flame Photometry. \[ \text{B. SO}_2 \;\longrightarrow\; \text{I. Flame Photometry} \]

Step 3: Match Pb with its method.
Lead (a heavy metal) is precisely measured by Atomic Absorption Analysis. \[ \text{C. Pb} \;\longrightarrow\; \text{IV. Atomic Absorption Analysis} \]

Step 4: Match Hydrocarbons with their method.
Volatile hydrocarbons are separated and quantified by Gas Chromatography. \[ \text{D. Hydrocarbons} \;\longrightarrow\; \text{II. Gas Chromatograph} \]

Step 5: Confirm the final match.
A-III, B-I, C-IV, D-II \(\Rightarrow\) Option (1).