How long we can use hygroscopic reference standard in terms
of water absorb.I mean in line with respective monograph's
specification or more than that?
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why plane of polarized light rotated by opticaly active compunds?
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How do u differentiate primary
defination of wavelength & wave number
what is the definition of limit of stray light in UV calibration
What is difference between known and unknown impurities
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why we use 0.1% acetone in gradient calibration of HPLC?
3 Answers Cipla, Dr Reddys, FDC,
Organic Chemistry 
