Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

In Analytical method development related substance method when did follow w/w method when did follow area normalisation method

Dr Reddys, Sun Pharma,

2 10232

In Analytical method development related substance method when did follow w/w method when did follow area normalisation method

5 9749

why a ph meter require KCL solution for their storing condition?


1 35309

What is Signal to noise ratio?

3 8882

what is the importence and role of LCMS and LCMS/MS and their applications? which type of compounds are analysis by lcms?

Millennium, GVK,


I have 1 gram of Diphenylamine and want to make a 10,000 or 1000 ppm solution in methanol. How do I make this?

Midas Technologies,

9 8550

Why forced degradation studies are performed in hplc method validation?


6 17637

why base line not starts from zero in gc?

Aurobindo, Reddy Labs, FDC,

1 7376

how to regulate noise in HPLC?

Vimta Labs, Alkem Labs,

2 4002

What is split

Vimta Labs,

4 8222

What is the purpose & importance of using the polystyrene film in ir calibration?

Vimta Labs,

3 9232

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

Reddy Labs, Vimta Labs,


why 1.2%kcl solution is using in limit os straylight?and why this test used for uv calibration?

Vimta Labs, Reddy Labs, Graviti Pharmaceuticals,

1 4633

why 0.02% solution toluene &noHexane using in uv calibration?

Ranbaxy, Vimta Labs, Graviti Pharmaceuticals, Orbit Pharma,

1 5789

what is the peak purity concept?

Vimta Labs, Graviti Pharmaceuticals,

5 16567

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Un-Answered Questions { Analytical Chemistry }

Principle of single pan analytical balance


what is %labelled amount in content uniformity of dosage unit and its calculation?


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


mode of absorption in alimentary canal?


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


What is the acceptance criteria for moisture balance when calibrated with sodium sulfate


what is the principle involved in turbidometry and nephelometry ?


My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards


What is FFA, PV, and PAV value in oil.


How we performed the force degradation for drug substance, is any specific guideline is available for each parameter(Acidic, basic, oxidation,heat)? what conditions you mentained for above parameters.


how a particular wavelength can be different for a particular compund while analysing by uv and by HPLC.


Which type of column should i use to check the purity of high molecular weight protein using HPLC reverse phase column chromatography? Hi everyone. I wanna to check the purity of high molecular weight protein (collagen) with MW of ~130 kDa using a HPLC. I know C18


why we are using benzene, anyline in acetic anhdride assay titration method?


sop of a uv visible spectrophotometer double beam elico model


What is control room temperature and which guide line says?