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Analytical Chemistry Interview Questions
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WHICH PRESSURE IS HIGH EITHER INJECTOR OR DETECTOR IN GAS CHROMATOGRAPHY

Reddy Labs, Avon Organics, Dr Reddys,

4 6620

What is the procedure for UV-spectrophotometer calibration?

 6 54306

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

 4 10729



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,

1905

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

NCL,

2594

How can we Qualify a unknown impurity by HPLC

 3 9569

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

Orchid,

10 27886

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

Lupin, Hikal, Wockhardt,

25 98875



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

Dr Reddys, RB,

2 23093

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

 7 20649

why the same column give different retention time in hplc?

 7 10566

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

 5 11080

What is the major difference b/w Drift and Noise

Aurobindo, Reddy Labs, Dr Reddys,

4 30526

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

Quintiles,

3 11387

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

Cipla,

2 6850

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Un-Answered Questions { Analytical Chemistry }

In performance Check of GC Why Hexadecane Peak is Considered 

1798

1.What is the difference between method validation and method verification 2.Which guidelines proposed to method transfer

280

Why potassium dichromate was using in Uv calibration?

515

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

2583

How can we calculate "confidence interval" in analytical method validation? Pl. explain with example.

2480




USP methodology, EP methodology, IP methodology, among three if possible to use one methodology for qualify working standard to use USP, EP, IP ? Please explain...

587

how to select short coloum and long coloumn for new molecule

1048

What is the formula to determine the concentration of M of a solution given the % transmittance? Use %T = 43.7 as an example.

1347

What is method validation in quality control

2430

Home heating oil or furnace oil what is made from? Can (base oil plus diesel/kerosen) = home heating oil?

893

what is lod and loq ?,why use k2cr2o7 , kcl h2so4 in uv calibration ?,why use benzophenone & caffene acetone in hplc calibration ?,what is leading peak in hplc ?why we do the calibration of limit of stry light in hplc & uv ?

2150

Why do we use KMnO4 in the test of control of obsorbance ? and why do we take specific quantity i.e 57-63mg?

1330

How we can determine water content in piperazine

917

what is the purge flow & how to calculate

1205

In the isomers,enantiomers give the only physical properties present such that no chemical properties present.

999

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