Discussion
What is the near infrared region used for chiefly?
Answer: B
The near infrared contains overtones and combination bands, which are weak and broad and so penetrate far into a sample - ideal for measuring moisture, protein or fat in grain or pharmaceuticals without preparation. Structural assignment needs the sharper fundamentals of the mid infrared, salts absorb far lower, and electronic transitions are ultraviolet. Weak absorption becoming an advantage because it permits deep penetration is a neat inversion of the usual priority.
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