Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

about analytical chemistry

Apotex,

790

What is differences between normality and molarity.in which cases both are used?

GVK,

1 4794

in gas chromatography what is the difference between gas flow rate and average linear velocity ?

USV,

1063




what are the ideal conditions for coloumn storage

Claris Lifesciences, Srikem Laboratories,

2 3831

i want to know about headspace and interview question on headspace

Srikem Laboratories,

1 3183

class of solvent regarding Residual solvent e.g. Acetone his class

1 2136

why we multiply 1000 in the determination of kf factor ?

Stellence Pharm Science,

3 4851

why we measure PH of a solution in PH only why not POH ?

Stellence Pharm Science,

1 2449




In Dissolution Test why limit is define Q+5% what is the role of +5%.

1565

Through assay by hplc(anhydrous basis) product got 100.8% .How much the potency of that product.Moisture content is 1.7%,Sulfated ash is 0.02%,Total impurities are 0.3%

2 3672

Why pyrene is also use for calibration if detector

Cipla, Dr Reddys,

1 2229

what is difference in ods I ods II is this is realy from sorbent / packing characteristics or from other means

Sandoz,

758

In gas chromatographic analysis sometimes we use headspace, why it is required instead of manually injection?

1 2659

How to fix the sample concentration in related substances development.

Novartis, Watson Pharmaceuticals,

3 5232

Who discovered X-ray

Huntsman Corporation,

2 2640


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Un-Answered Questions { Analytical Chemistry }

what type of question will ask in the interview of lab chemist.

2161


why we use a particular hplc column for a particular compound give reasons?please

1562


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?

2136


what is the purge flow & how to calculate

1234


how to selecet an exact coloumn for an new molecule development by hplc how to select exact salt as buffer for new molecule development by hplc what is the the process to select the mode of saparation of compoundes by hplc what is the use of ph of buffer what is use of buffer,ph,organic phase,ans methods how the molecules get saparated in coloumn,

1178






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

1019


Why acetonitrile and water are used as extraction solvent when analysis melamine? I thought they are miscible and won't be able to separate...

334


why disodium tartarate used in karl-fischer instrument ?.

777


What is viod volume and peak purity in HPLC?

1434


what is different when impergnated silica plates are used in separation of azo dyes using column chromatography?

730


Ratio of Water and Acetonitrile(diluent) is not recommended to use in cleaning method validation,why?

1714


What is intact assay method development.....?

1170


what is the extinction coefficient for Indomethacin or at 319nm wave length.

2625


How we can determine water content in piperazine

943


what is definition of validation? which components are followed give detail?

955