Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What are the different types of columns used in HPLC


2 8160

In HPLC when we use Isocratic method, Gradient method in hplc?


8 13069

Any molecule is filing for ANDA purpose, what are the dissolution requirements / specifications needed ?


1 3743

What is Endcapped Hplc column

2 6094

Why we more noise in PDA detector compared to UV detector?


1 7973

if the purity is 99.9%,is need to do assay?

Reddy Labs,

3 10701

What is the difference between specified impurity and Identified impurity


3 8620

What is the difference between specified impurity and Identified impurity

Merchant Navy,

1 2324

how do you established the RRF for unknown impurity

Square Pharma,

3 7348

I want analyze my compound at 325 nm so which standard shall i use to calibrate my HPLC system? How i can assure my hplc detector is suitable or not?


2 6134

How we will choose pH of a mobile phase if analyte pKa value is 4

Laurus, Celon Labs,

2 7542

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

Laurus, DRL,


Which column is more polar, C8 or C18?

Glenmark, Cipla, Laurus, Torrent Power,

6 18093

what is the difference between heavy metals and sulphated ash


2 10314

what is difirence b/w ROI&ROE


1 6327

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Un-Answered Questions { Analytical Chemistry }

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,


mode of absorption in alimentary canal?


What are usp limits for total impurities,unknown impurity


what type of questions asked on analytical balance and also give answers................all pharma companies?


why we should take dst factor for below 1%moisture samples


how to select short coloum and long coloumn for new molecule


from where i get mortar pastle for glass bottle crush? it's required for testing of it?


How can we confirm the HPLC column is end-capped or not? Is it possible to identify by physical appearance?


How would you decide dissolution medium for NCE compound of class I drug


which one is better separation in high pressure liquide chromatogram orlowpressure chromato gram in hplc


explain 5 components of gas chromatography ?


how the compound separate in coulunm,explain


During Validation study, Recovery is passing at all levels but Linearity is failing. Justify?


In dissolution test s1 stage we are getting one bowl 40 % out of 6 bowls what is the root cause you find and how proceed next step? ( Q is 80%)


what is the limit for KF Factor ,we take factor using water we will found factor between 6 to 7 ,while on KF Reagent bottle mentioned 5 mg/ml water content.if we not use dried methanol it is effect on factor.