Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What are the different types of columns used in HPLC

Wockhardt,

3 11581

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

Pharmaceutical,

8 19927

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

IPCA,

1 5412

What is Endcapped Hplc column

2 8702

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

Aurobindo,

1 10681

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

Reddy Labs,

3 13947

What is the difference between specified impurity and Identified impurity

Glenmark,

3 14790

What is the difference between specified impurity and Identified impurity

Merchant Navy,

1 5127

how do you established the RRF for unknown impurity

Square Pharma,

6 11381

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 8767

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

Celon Labs, Laurus,

2 10331

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

DRL, Laurus,

3112

Which column is more polar, C8 or C18?

Cipla, Glenmark, Laurus, Torrent Power,

6 27908

what is the difference between heavy metals and sulphated ash

Aurobindo,

2 16758

what is difirence b/w ROI&ROE

Pfizer,

1 8523


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Un-Answered Questions { Analytical Chemistry }

How to determine the EDTA content by potentiometry titration in Ceftriaxine sodium

1993


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

3112


why does used dry caffien in HPLC calibration?

1571


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

1555


in dissolution why pool sample needed? in which type of drug pool sample need?

2598






Why only Copper standard is used to calibrate Atomic Absorption spectrophotometer?

2150


in DMF having extra impurities and in api COA also having extra imp than USP or BP product then how require to proceed?

350


for heavy metal test lead used in which form pure form or any other form for preparation of lead standard sol

5315


In rs method development when we are going area normalization method to dilute standard method?

952


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

4633


How to fix the sample conc. in Related substances test by HPLC?

619


Colorimtry

1180


EXPLAIN THE CALCULATION PART OF AN KF TITRATOR CALIBRATION WITH SUITABLE EXAMPLE

2142


what is impurity profile. how to interpret this impurity profile to a drug product or drug substance.

2210


what is the structure of DOWEX-50

4931