Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What is the principle of GC/HPLC ?

BioCan, Biocon, Megafine Pharma,

4 44745

Why pH Range has been fixed as 0 to 14 ?

Matrix, Akums, Cipla, SUN,

1 4025

How you develop a method in HPLC?

Wockhardt, Perrigo, CU,

1189




why using buffers in hplc inteed of water

5 7942

How long we can use hygroscopic reference standard in terms of water absorb.I mean in line with respective monograph's specification or more than that?

1 1097

Why we use methy Ethyl Propylparabine For HPLC Calibration

1 3076

What is use of LOD and LOQ in validtion and give range and in calculation why we use 3.3* LOD here why we use 3.3

Reddy Labs, Dr Reddys, IPCA,

1 2642

In specificity what parametrs are consider why that parametrs

2 3609




ash or residue in that what will be there.

2 2953

How can we determine Moisture content of HI?

Cipla, Reddy Labs,

968

What is difference between oos

Gennex,

7 20014

what is the differance between Analytical and semi micro balance?

2 8811

In the method validation proceedure,lod & loq calculation we use the formulae for LOD=3.3*SD/slope and for LOQ=10*SD/slope,why we use 3.3 & 10 in the formulae?

1 7957

In HPLC Chromatographic separation Resolution equation is Rs = 1.18 (tR2 –tR1)/wh1+Wh2, Where, tR2 and tR1 is run time of eluent ratios of the distances from the point of application to the centers of the spots and the distance travelled by the solvent front from the point of application (retardation factor), and Wh1and Wh2 , is peak width of at half height. What is 1.18 ?

1 3090

what is mean by theoritical plates(not formula) ?

Micro Labs,

4 9633


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Un-Answered Questions { Analytical Chemistry }

Why only Copper standard is used to calibrate Atomic Absorption spectrophotometer?

1138


Principle of single pan analytical balance

3489


What is the difference between Discriminating media and DPDM(Dissolution Profile with Different Media)

4984


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

1087


WHAT IS THE CRITERIA FOR SELECTION OF TIME OF DISSOLUTION AND THE MEDIUM OF DISSOLUTION?

1292






Please tell me about the pH of Polycaboxylic ether is it in the 5-6 range ever or more than 6

1240


what are the standard methods for HPLC?

1407


What is the difference between purge septum flow and column flow in gas chromatography?

687


What is the meaning of Base deactivated vials

923


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

133


how to select short coloum and long coloumn for new molecule

922


How to choose the which salt is suitable for mobilephase

1564


How can we determine Moisture content of HI?

968


how to get accurate result for Residue on evaporation in purified water

192


how to calibrate hplc & gc

3014