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 6317

What is the procedure for UV-spectrophotometer calibration?

6 53146

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

4 10128




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,

1775

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

NCL,

2485

How can we Qualify a unknown impurity by HPLC

2 9144

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

Orchid,

10 26598

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

Lupin, Hikal, Wockhardt,

25 95912




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

Dr Reddys,

2 21763

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

7 19300

why the same column give different retention time in hplc?

7 10064

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

5 10712

What is the major difference b/w Drift and Noise

Aurobindo, Reddy Labs, Dr Reddys,

4 28815

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

Quintiles,

3 11084

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

Cipla,

2 6424


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Un-Answered Questions { Analytical Chemistry }

what parameters we will consider while developing a HPLC method and how we confirm our HPLC method is valid?

2114


why we are using benzene, anyline in acetic anhdride assay titration method?

752


How we can determine water content in piperazine

810


what is difference between zero air gas and o2 gas

5449


using gradient pressure in gas chromatography are not ?using gradient pressure why

2047






Which is the highly polar and highly non polar column in HPLC?

694


How to determine water content of bis tetrazole amine mono ammonium salt

1792


How they found 1mL of K.F reagent is equivalent to 5mg of water and if we change the composition of K.F reagent, is it can neutralize more amount of water?

237


Identify problem faced when mass spectroscopy is used with HPLC system ?

609


how the compound separate in coulunm,explain

925


how will you do the prep for unstable componds?

589


process of Diclofenac sodium,IP.

797


For limit test of heavy metals in BP, Method C require that the substance is ignited at a temperature not exceeding 800 °C. Why confines such the temperature?

2217


are there in uv lamb that is chractrestic for wavelenghth 205 nm ?????

644


please explian me about area normalisation method,diluted standard method,impurity vs impurity and which one has to be selected in method development

241