Chemistry Reaction Kinetics PMC 2021
PMDC Verified Question 45 of 80
When rate of reaction is measured by the amount of radiation absorbed, it is called:
A
Optical rotation method
B
Refractometry method
C
Electrical conductivity method
D
Spectrometry
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Official Correct Choice:
Option D: Spectrometry
Concept:

Different physical properties are used to track the progress of chemical reactions based on the nature of the reactants and products.

Solution:

  • Spectrometry (or spectrophotometry) is the specific analytical method based on measuring the interaction between matter and electromagnetic radiation.
  • If a reaction mixture absorbs specific wavelengths of light (UV, visible, IR), a spectrometer measures the exact amount of radiation absorbed over time to calculate the rate.


Why other options are incorrect:

Optical rotation measures changes in polarized light angle. Refractometry measures the bending of light. Electrical conductivity measures ion movement.

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