Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What are the different types of columns used in HPLC

Wockhardt,

3 11535

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

Pharmaceutical,

8 19841

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

IPCA,

1 5383

What is Endcapped Hplc column

2 8662

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

Aurobindo,

1 10658

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

Reddy Labs,

3 13881

What is the difference between specified impurity and Identified impurity

Glenmark,

3 14744

What is the difference between specified impurity and Identified impurity

Merchant Navy,

1 5073

how do you established the RRF for unknown impurity

Square Pharma,

6 11303

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?

AMRI,

3 8715

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

Celon Labs, Laurus,

2 10299

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

DRL, Laurus,

3100

Which column is more polar, C8 or C18?

Cipla, Glenmark, Laurus, Torrent Power,

6 27818

what is the difference between heavy metals and sulphated ash

Aurobindo,

2 16708

what is difirence b/w ROI&ROE

Pfizer,

1 8478


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Un-Answered Questions { Analytical Chemistry }

please explain about aluminium hydroxide assay

699


What is the use of tlc and hplc? And when and where use?

655


Why to use propyl paraben in HPLC gradient calibration

6066


what is procedure of actual procedure for registration of drug?

1446


What is split ratio in Gc? Splitless? how requirr to select?

316






Why only 1.2 million lux hours require in photostability study?

451


Hi sir if any product monograph not given known impurities (may be 5 impurities) specifications then how we require to proceed for inhouse formulation?

272


how to decide for one product require water content or LOD?

321


In Assy by potentio metry titration method how select MET U ,DET U, SET U,

1300


In which situation we require to prepare the standard solution from sample in Related substance method?

280


Is it nessesary all multimedia dissolution require descriminatory?

327


why cone formation during dissolution?

309


how require to select dissolution media? what is discrimination?

302


How to choose the which salt is suitable for mobilephase

2637


all types of questions asked at the cipla interview

4133