Analytical Chemistry Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Analytical Chemistry Interview Questions

Questions Answers Views Company eMail

What are the different types of columns used in HPLC

Wockhardt,

3 13169

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

Pharmaceutical,

8 22511

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

IPCA,

1 6377

What is Endcapped Hplc column

2 9675

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

Aurobindo,

1 11649

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

Reddy Labs,

3 15169

What is the difference between specified impurity and Identified impurity

Glenmark,

3 16217

What is the difference between specified impurity and Identified impurity

Merchant Navy,

1 6080

how do you established the RRF for unknown impurity

Square Pharma,

6 13163

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 10135

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

Celon Labs, Laurus,

2 11398

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

DRL, Laurus,

3701

Which column is more polar, C8 or C18?

Cipla, Glenmark, Laurus, Torrent Power,

6 30405

what is the difference between heavy metals and sulphated ash

Aurobindo,

2 18129

what is difirence b/w ROI&ROE

Pfizer,

1 9674

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Un-Answered Questions { Analytical Chemistry }

what is difference between UV - VISIBLE MODEL NO like 1600,1601,1700 etc ? plz explain me

2691

how can I make the copper get white bye any salt or acit?

2215

If we do accuracy at same concentration at which linearity planned,what is the need to do linearity separately?

2311

what is the extinction coefficient for Indomethacin or at 319nm wave length.

4077

Tell me something about Vitamin A test method by HPLC

2686

how a particular wavelength can be different for a particular compund while analysing by uv and by HPLC.

2314

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

1826

how to calibrate hplc & gc

4516

WHAT IS THE PURPOSE WE USE HCL, CHOPPER, BURNER, MONOCHROMATOR in AAS? PLEASE EXPLAIN BRIEFLY

2622

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

2048

In Dissolution Test why limit is define Q+5% what is the role of +5%.

3112

My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards

1607

Basic principle of ESI?

2156

WHY pKa value is more important than pH value of the mobile phase in HPLC?

1773

what is mean by ambient temperature?

927

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