Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what is dwell volume in HPLC?

Aurobindo, Cadila, Strides, SUN, Sun Pharma,

2 6378

what does pH stand for?


4 6672

Definition of beers_ lamberts law

Aarti Industries, Agio Pharmaceuticals, Emcure, Supriya Lifescience,

4 6374

Why monograph of hplc coming upperside of drift but in IR monograph coming in drift side?

1 3171

Why a1% value is used for some product ? What is the criteria for selection a1% value ?

Zim Laboratories,


Why the ph limit (1_14) Is used?


3 6801

What is cut off value of solvent used in hplc


1 5399

How to calculate mass balance in RS after degradation

Reddy Labs,

1 4956

if out of two set of results of moisture analysis first 1 is passing, second one is failing, is it oos ? or vice a versa first 1 is failing and second one is passing. for information mean value to be reported and in mean value the substance is ppassing, is it oos or normaal mean value to be considered?


1 2805

Can we interpret accuracy from linearity in method validation?

Dr Reddys, Lupin,

1 1961

What is aggregate and fragments in SEC?


how pyridine can be analysed other than GC?

1 3220

What is the calibration of uv process and preparation



How to prepare 1000ppm methylene blue solution

2 17918

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

College School Exams Tests,


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Un-Answered Questions { Analytical Chemistry }

why salisylic acid not using now days for disdolution calibration?


why we are using hexane in calibration of number of drop per mL


How require to develop GC method? how to select diluent, GAS, column selection and other chromatographic conditions?


what is mean by dissolution biowaiver study?


effect of pore size, pore volume, partical size, column length, carbon load on retention time? what is carbon load? what is the use?


What is the Formula for coreletion coefficient in plhplc calibration


Why six unit used for precision?


why glutent are detected in the rice cereal baby food product even manufacturer claimed that they are using rice and milk only?we have using ELISA to do the test,and rice supposed not containing any glutent,rite?We already repeat the test so many times and it still detected.just wondering where the glutent came from?


How to calculation of residual solvent methanol (3000 ppm) standard solution, and how many quantity used of test sample


which lights using during force degradation?


if rsd failed then what require to do?


in DMF having extra impurities and in api COA also having extra imp than USP or BP product then how require to proceed?


What is mean by PDR?


If vendor having more imp than monograph then how to proceed? and how to set spec?


in api coa contains only process impurities and in product coa contains degradation impurities?