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Chemistry Interview Questions
Questions Answers Views Company eMail

what is the principle of UV Vis spectroscopy, AAS, ICP OES,ICPAES, ICP-MS and FTIR

Perkin Elmer,

9180

What is the principle of HPLC, GC, LCMS, GCMS,LC QQQ, GC QQQ, LC Q TOF and GC Q TOF. What are the applications and Specificity?

8807

What is the difference between Spectroscopy and spectrophotometry,What are the applications?

Caplin Point, Cipla,

4 11701

What is difference b/t uv detector and rid

5 11084

i set electrode to 7 buffer than i used it to check 4 buffer and 10 buffer if the results are not as expected than is it better to set the buffer again to 4 buffer or is there any other method available please let me know ...

Glochem,

2 7014

can you separate isomers by using column chromatography?

2 7756

How much is the standard area for glc analysis

2211

function of detecter in hplc ,gc and spectroscopy? function of carrier gas in gc?

DRL,

2609

what type of compounds do we see lod @ wat type compounds do we see m.c

Orchid,

3 9331

How can the GC or HPLC method is selected to determine the impurity profile in drug product?

Ajanta,

1 7482

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

Cipla, Rampex Labs,

4150

What the difference in loss on drying and residue on ignition

2 34981

Why irmoisture balance is used for corrugated box moisture testing

Leiutis, Lupin,

2354

why we are used 4,7,9,2 buffers for the ph calibration

Aurobindo, Enaltec Labs,

4 19425

In case of HPLC coloums what is the difference Between C8 & C18 coloums & how can we select difference type of coloums like Inertial ODS , Hypersil BDS , ODS etc.?

MSN Pharma,

4 33207


Un-Answered Questions { Chemistry }

how to calculate elemental impurities?

987


what is silicon chip

2038


What precaution u take when doing rs preparing

2065


there is something which we call as the basicity of an acid i wanted to ask is that is there something like the basicity of an alkali if yes than how can we define it?

1995


in hplc chromatogram started from left to right and in uv spectrum started from left to right

889


Explain the process of protactinium-uranium fractionation and its implications for understanding geological and geochemical processes.

625


How is librated iodine estimated?

1026


Protactinium-231 decays to Uranium-235. How is this decay used in radiometric dating and the determination of geological ages?

515


Active Ingredients in septilin ??

1638


What is the accepted microbial load in APIs as per USP.........?

2453


What is the difference between fractionation and distillation?

1058


What is meant by ph of a solution?

965


in stress study if your api not soluble in hcl naoh h2o2 then what require to do?

792


why xterra column require to use at higher ph?

869


why does used dry caffien in HPLC calibration?

1983