Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What is the principle of GC/HPLC ?

BioCan, Biocon, Megafine Pharma,

4 47583

Why pH Range has been fixed as 0 to 14 ?

Matrix, Akums, Cipla, SUN,

1 4472

How you develop a method in HPLC?

Wockhardt, Perrigo, CU,


why using buffers in hplc inteed of water

5 8463

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 1258

Why we use methy Ethyl Propylparabine For HPLC Calibration

1 3334

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,

2 3073

In specificity what parametrs are consider why that parametrs

2 3881

ash or residue in that what will be there.

2 3188

How can we determine Moisture content of HI?

Cipla, Reddy Labs,

1 1199

What is difference between oos


7 20921

what is the differance between Analytical and semi micro balance?

2 9483

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 8298

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 3499

what is mean by theoritical plates(not formula) ?

Micro Labs,

4 10182

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Un-Answered Questions { Analytical Chemistry }

What is third generation HPLC Columns?


As per ICH related substances stability trend limit from initial to shelf life


How you develop a method in HPLC?


What is AV value in test uniformity content ,describe calculation


In IR spectra, generally a molecule vibrates without apply emr or ir light?


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


While performing TOC sst analysis Zero shift disabled & sample analysis zero shift enabled why?


when we talk about change in entropy we consider total entropy means of surround +entropy of system but when we talk about change in Gibss free energy we consider entropy of system.explain with reason.


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


iam usig ph buffers merk. manually how to prepare ?


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


Why potassium dichromate was using in Uv calibration?


How much is the standard area for glc analysis


what is the procedure for cleaning of lenses of hatr accesory of ftir instrument?


why equlirium conatant of water have 14 value