Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

please explian me about area normalisation method,diluted standard method,impurity vs impurity and which one has to be selected in method development

Pfizer,

240

How they found 1mL of K.F reagent is equivalent to 5mg of water and if we change the composition of K.F reagent, is it can neutralize more amount of water?

237

How can we calculate offset value pH measurment

Dr Reddys,

119




What is stray light in uv what are units for stray light

Dr Reddys,

127

Colorimtry

Dr Reddys,

143

What are usp limits for theoritical plats,resoution,tailing factor,peak to valley ratio

Dr Reddys,

192

What are usp limits for total impurities,unknown impurity

Dr Reddys,

1 334

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

192




Why acetonitrile and water are used as extraction solvent when analysis melamine? I thought they are miscible and won't be able to separate...

133

In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?

224

could negative ions be produced by bombardment process in mass spectrometry?

111

A ha tc is actual defination of retention time?

142

How to check hplc detecter sensitivity?

Gland Pharma,

157

(0.41)d what is d?

Gland Pharma,

1 234

How to estimate potassium?

121


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Un-Answered Questions { Analytical Chemistry }

what is procedure of actual procedure for registration of drug?

543


what is the disso medium for tropsiun chloride

806


Explain the relations between number of carbon atoms in alkanes and retention time ?

535


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

1094


is it necessary to do HPLC calibration at wavelength 315nm if we are doing analysis at this wavelangth

486






what is the procedure for cleaning of lenses of hatr accesory of ftir instrument?

979


How to choose the which salt is suitable for mobilephase

1564


What is the pilot-plant in pharma sector.

882


What is Band broading effect explain

476


how will you do the prep for unstable componds?

589




962


What is the calibration of uv process and preparation

592


why should we perform dissolution PVT calibration only by UV spectrometer, not by HPLC ?

288


what is the identification test of volatile substance? what is volatile compound?

893


why we are using hexane in calibration of number of drop per mL

157