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Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

wen v have polr solvent then which type of column use in hplc

2 5957

What is Threshold in hplc?

Hetero,

2 16220

Why we use Caffeine in hplc calibration

Emcure, Laurus,

2 11184

what is the meaning of stress study?

Reddy Labs,

2 3079

what is the difference between potentiometric assay and hplc assay

Parabolic,

2 13628

why we are using buffer solutionas as a mobile phase in hplc.

2 9072

importance of internal standard and in what conditions it is used?

1 3117

how to selecet an exact coloumn for an new molecule development by hplc how to select exact salt as buffer for new molecule development by hplc what is the the process to select the mode of saparation of compoundes by hplc what is the use of ph of buffer what is use of buffer,ph,organic phase,ans methods how the molecules get saparated in coloumn,

1441

how to select short coloum and long coloumn for new molecule

Rampex Labs,

1359

what is poarimeter, why it is used in pharma,and explain briefly about polarimeter?

GVK,

3 8447

Why KBR is used in IR for preparation of pellete, why it shows zero dipole moment

GVK,

7 9121

what is optical active and non active give examples?

GVK,

1 3485

what is custom fields in waters system?

Akorn India, Aurobindo,

1 6776

my name is santhosh i cmpleted b.pharmacy in 2009 then i went to uk in 2010 to pg diploma business management. after i came back to india.. recently again apply to uk for pharmaceutical analysis. they refused my visa you failed to explain y u r change subject. so plz ineed answer for y change the cource

1 1945

why kbr is used for pellet preparation in ir spectroscopy, give the reasons? why kbr shows zero dipole moment?

6 12735


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Un-Answered Questions { Analytical Chemistry }

Identify problem faced when mass spectroscopy is used with HPLC system ?

998


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.

1057


What is similarity factor and its use in api strength?

206


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

7241


what is turbidimetric titration?Give 2 examples.

1428






what parameters we will consider while developing a HPLC method and how we confirm our HPLC method is valid?

2526


How to choose the which salt is suitable for mobilephase

2077


what is the difference between potentiometric titration and karl fischer titration?

1702


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

1465


in gas chromatography what is the difference between gas flow rate and average linear velocity ?

1317


Many times I don't got a caffeine peak in calibration of hplc using guard column ❓

628


What is importance of pH in the Heavy metal test and How it effect on the test results?

1285


We use Potassium Dichromate solution for the calibration of UV-Visible Spectrophotometer in UV region. My question is to calibrate visible region which solution could be used in photometric accuracy

613


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

2129


Why are use silicon oil mr?

176