Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

why urasil use in hplc column perfomance?

Bayer,

1 5622

how do you perform reverse enginearing study for drug containing sodium chloride sodium citrate sodium bicarbonate

Strides,

1 2258

How will u perform degradation study in detectors other thann PDA in HPLC Methodology

Micro Labs, Adley,

1218




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

1044

what is the working priniciple of ph, what are parts in ph meter

1 7132

why using the ph 4,7,9.2?

SRF,

1 3274

What is Temperature ?

Reddy Labs,

2 7199

What is the column performance and column efficiency?

Reddy Labs,

1 8156




why we are using in ph calibrations ph4,7,9.2 buuffers only?

Reddy Labs, Unichem,

3 12111

Is it necessary to validate both assay and related substances for usp official methods for products.

Apotex,

6 8158

why we use a particular hplc column for a particular compound give reasons?please

Natco, Dr Reddys, Indoco Remedies,

1490

IS THERE ANY EQUIPMENT TO CHECK AND CALCULATE THE POLARITY OF A LIQUID?

Reddy Labs,

1208

what is the difference between lod and loq?

Apotex, Aurobindo,

4 25643

What should be the level/ Percentage of Arsenic in Arsenic free zinc.

Pharmaceutical, FDC, Laurus,

1010

What is the exact reason to use THF and IPA in buffers of Reverse phase HPLC as a solvent?

Dr Reddys,

2472


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Un-Answered Questions { Analytical Chemistry }

how you determine moist.of NaOH sol or NaOH flacks

997


how much mass should be there in volumetric flask while in preparation of sample for assay? 

1137


We use hicrome 10 cxs column in hplc analysis....pls tell me.. what is the meaning of 10 cxs?

245


Ratio of Water and Acetonitrile(diluent) is not recommended to use in cleaning method validation,why?

1647


how can give the expiry period and restadardisation of volumetric solution

1281






what is the structure of DOWEX-50

3647


if you have given a blank water how you analyse by general analytical techniques?

700


we are performed SOR for a particular product the limit is -6 to -10.We face particular bathes it is not meeting the specification.we performed diffrent instrument diffrent analyst we are getting diffrent diffrent results.solvent is dimethyl sulfoxide what could be the reasion

455


USP methodology, EP methodology, IP methodology, among three if possible to use one methodology for qualify working standard to use USP, EP, IP ? Please explain...

529


how to calculate corelation coefficient in G.C Calibration? what is the calculation part?

962


How to decide assay range for non pharmacopeial API analysis by HPLC? Could you give me any reference for same e.g Guidelines or Paper publications?

1843


What is column in chromatography?

777


What is the principle of HPLC, GC, LCMS, GCMS,LC QQQ, GC QQQ, LC Q TOF and GC Q TOF. What are the applications and Specificity?

5725


can i use hplc detector to uplc and why?

925


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

2530