Which of following is used to calibrate the absorbance scale in UV-Visible instrument?

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Which of following is used to calibrate the absorbance scale in UV-Visible instrument? Answer: K₂Cr₂O₇

K2Cr2O7 (Potassium dichromate): This is a strong oxidizing agent, not a base. It is often used in organic chemistry to oxidize alcohols to ketones or carboxylic acids.

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