题目内容
It is known that the infrared spectrum of a certain compound has main absorption at 1450 cm-1, 3000～2800 cm-1, 1380 cm-1, 725 cm-1, etc., then the compound may be （ ）
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The stretching vibration of water molecules will not produce infrared absorption peaks.
a is b
In the process of spectrophotometric analysis, in order to reduce the influence of measurement errors, what range should the absorbance of the solution be controlled?
The concentrations of Cl-，Br- and I- can be determined respectively by Mohr method.
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