Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

WHICH PRESSURE IS HIGH EITHER INJECTOR OR DETECTOR IN GAS CHROMATOGRAPHY

Reddy Labs, Avon Organics, Dr Reddys,

4 6506

What is the procedure for UV-spectrophotometer calibration?

6 53896

What should be the calibration procedure for wavelength accuracy in case of HPLC?

4 10494




How to decide assay range for non pharmacopeial API analysis by HPLC? Could you give me any reference for same e.g Guidelines or Paper publications?

NCL,

1843

How to compare XRD graphs against standard and carry polymorpism study of API's by powder XRD method?

NCL,

2550

How can we Qualify a unknown impurity by HPLC

3 9414

full name of OOS & OOT ? Dercribe it with details ? why this is needed in pharma industry ?

Orchid,

10 27416

why KBr is used in FTIR SPECTROSCOPY and why is it necessary to triturate KBr during FTIR analysis?

Lupin, Hikal, Wockhardt,

25 97842




what is stability study ? why it is needed and how itis done

Dr Reddys, RB,

2 22642

why water, methanol, ethanol ets solvents are used in UV SPECTRIPHOTOMETER for blank reading ?

7 20010

why the same column give different retention time in hplc?

7 10390

How will decide to use HPLC OR GC for developing method for unkown compund

5 10942

What is the major difference b/w Drift and Noise

Aurobindo, Reddy Labs, Dr Reddys,

4 29916

what king of work is done in Regulatory Affairs in Pharma industry ?

Quintiles,

3 11290

can some other acids like nitric acid or HCl can be used in the calibration of UV.Vis. spectrophotometer????

Cipla,

2 6666


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Un-Answered Questions { Analytical Chemistry }

How do we quantify crystaline and amarpous forms by using (NMR, XRD)spectroscopic techniques? Which any others instruments are useful for this quantification? explain

1135


A ha tc is actual defination of retention time?

207


WHAT IS THE USE OF STARTER ?????????

1071


what is the disso medium for tropsiun chloride

884


How do we get end points and how many end points are possible for citric acid and di-acid not theorotically answer should be given practically.

1197






How to define samples weight in moisture content

110


What is control room temperature and which guide line says?

330


I have compare C2H2-air and C2H2-N2O flame AAS on determination calcium. Both use same range of std to plot calibration curve. (2-6ppm) When i measure the sample with phosphate, KCl and LaCl, C2H2-N2O flame give false positive result, around 0.5ppm. When i measure the sample with phosphste, KCl and EDTA. C2H2-N2O flame also give 0.5ppm false positive. But both above mentioned sample would not give false positive when measured by C2H2-air flame. What is the reason?

2032


How can we calculate offset value pH measurment

185


what is the procedure for cleaning of lenses of hatr accesory of ftir instrument?

1045


Can we interpret accuracy from linearity in method validation?

733


in dissolution why pool sample needed? in which type of drug pool sample need?

1809


How can I develope method of dissolution by HPLC OR UV

954


why lactose has less charges when packed in steel containers when compared with packing of lactose in polyamide material?

942


In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?

292