Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What is difference between Potency & purity

3 10023

how to hplc calibrated

Glochem, Dr Reddys,

4 41084

state the principle of gas chromatography?

5 8151




Why noise test is performed at 254 nm in calibration of HPLC system?

4 11891

some compound havving uv region but not give much more response during hplc analysis

2 4271

I have got selected for Aurobindo Pharma AR&D, HR person is asking me to sign in agreement. can I join?

Aurobindo,

19 27215

Why sulfuric acid is used in sulphated ash / residue on ignition test.

Dr Reddys, Micro Labs, Wings Customer Care, Samrudh, Watson Pharmaceuticals, HPLC, CS Pharmaceuticals, GVK,

8 47709

what are the basic requirement for the WHO audit?

BioPlus,

1 6413




What is the thickness of polystyrene film?

Pharmaffiliates Analytics and Synthetics,

8 11182

During Validation study, Recovery is passing at all levels but Linearity is failing. Justify?

Torrent Pharma, Mylan,

1345

What is Stray light ? & what is the IMP of this

2 6888

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

915

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

887

why we use only sucrose in the calibration of polarimeter?

Kilitch,

5 15103

What is the Deference between Bulk density & Tap density ?

Reddy Labs, Hikma Pharmaceuticals, Neuland,

2 18720


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Un-Answered Questions { Analytical Chemistry }

Dear sir, This is R.Kadambavadani working in a pharma industry. while doing RS analysis of ibuprofen API, unknown peak eluting some times in the 0.6 Min RT. Kindly send me what is the exact reason behind that. also am using ACN the mobile phase.

212


in dissolution in one tablets two molecule one is losartan & second is HCTZ losartam is complies in s1 stage & hctz is complies in s2 stage then how to report result losartan s1 stage result or losartan s2 stage result

837


what is separation techniques.

1268


when we talk about change in entropy we consider total entropy means of surround +entropy of system but when we talk about change in Gibss free energy we consider entropy of system.explain with reason.

710


why we use sodium salicylate in uv light calibration at TLC chamber

4682






What is the calibration of uv process and preparation

592


why we do the calibration of limit of stry light in hplc & uv

1318


Colorimtry

143


How you develop a method in HPLC?

1189


How do we get end points and how many end points are possible for citric acid and di-acid not theorotically answer should be given practically.

1134


how to get accurate result for Residue on evaporation in purified water

192


Principle of single pan analytical balance

3489


sop of a uv visible spectrophotometer double beam elico model

4027


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

1159


I have compare C2H2-air and C2H2-N2O flame AAS on determination calcium. Both use same range of std to plot calibration curve. (2-6ppm) When i measure the sample with phosphate, KCl and LaCl, C2H2-N2O flame give false positive result, around 0.5ppm. When i measure the sample with phosphste, KCl and EDTA. C2H2-N2O flame also give 0.5ppm false positive. But both above mentioned sample would not give false positive when measured by C2H2-air flame. What is the reason?

1942