Which of following is used to calibrate the absorbance scale in UV-Visible instrument?
الٹرا وایلیٹ مرئی آلے میں جاذب پیمانے کو کیلیبریٹ کرنے کے لئے مندرجہ ذیل میں سے کون سا استعمال ہوتا ہے؟
Answer: K₂Cr₂O₇
Explanation
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