Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what is rs test why we are perfoming rs test

2 9476

In GC calibration,what is the procedure to calibrate the TCD (thermal counductivity detector)suggest ?

Orchid,

2687

What is difference between silica used in TLC and HPLC column

Cipla, Meghmani Organics,

4 17633

Why Urasil and Caffeine use for HPLC wavelength accuracy calibration. which is most suitable, Why? other than these which can be used?

Cipla,

7 16815

When we r doing processing method for sst in Empower software by HPLC, What value has to give in void volume and as per which pharmacopia!

Micro Labs, Mylan,

5 13317

what is use of acetonitrile compare to methanol in RP-HPLC Method devlopment

Neuland, Orchid,

7 21872

is a bonded water molecule in an organic material can be easlisy and accuractly determined by KF rather than LOD

2 6631

How to know HPLC column performance?

Meghmani Organics,

4 11641

What is heavy water

Meghmani Organics,

3 7701

What will be the effect on HPLC analysis result if three mobile phases given separately through three valves and same proportion mixed together and given by one valve?

LOIL,

1 4459

Which products will produce when acetic anhydride reacts with Ter-butanol, Sec-butanol, Iso butanol, Dimethylamine etc.

2364

Why PH range from 0to14.

College School Exams Tests, Reddy Labs, Wings Customer Care,

2 13088

why you are using benzoic acid for water content determination in TEA

2 6806

difference between instrumenent and equipment

6 12013

mixed 1.0 ml of methanol and 1.0 ml of toluene and injected in gas chromatography.will you prove that both solvents are in the ratio 1:1(not by area normalization)

1 2865


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Un-Answered Questions { Analytical Chemistry }

How we choose the mobile phase for method development.?

625


Related substance method equivalency on control sample or spiked sample?

284


which situation gc hs and gc als require to use?

275


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

1526


How we performed the force degradation for drug substance, is any specific guideline is available for each parameter(Acidic, basic, oxidation,heat)? what conditions you mentained for above parameters.

1768






if you get peak in blank then what require to do?

463


UV and PDA detector, which have less signal to noise ratio?

620


how require to select dissolution media? what is discrimination?

286


what is the principle involved in turbidometry and nephelometry ?

3605


What is the principle of Thermal conductivity detector and FID?

2232


What is control room temperature and which guide line says?

1132


WHY given much noise PDA dector then VWD Dector

1483


If change in specification which parameter require to do for validation? if change in chromtographic condition then which parameter? if api change then which parameter? if change composition then which parameter? if old method not work out then whicj parameter? if additional one impurity added then which parameter of validation require to do on above each conditions? elaborate separately

330


Why potassium dichromate is used in calibration of uv?

1351


What is mean by PDR?

302