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3. In the KMnO4 method, the KMnO4 solution can be filled with a basic burette for titration.

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2. According to the acid-base proton theory, the solvent can both give protons and accept protons, which are amphoteric substances.

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1. The analysis of pure NaOH (solid) can be used to prepare standard solution directly.

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Regarding the spectrophotometer, which of the following statements is incorrect?

A. The light source of the visible light spectrophotometer is a tungsten lamp
B. Use prism or grating as monochromator;
C. Must use quartz cuvette as absorption cell;
D. Use photomultiplier tube or photodiode as detector

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When applying Lambert-Beer law for quantitative analysis, what kind of light should be used as incident light?

A. White light
B. Sun rays
C. Monochromatic light
D. Ultraviolet light

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