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

Pfizer,

1092

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?

 1293

How can we calculate offset value pH measurment

Dr Reddys,

1061

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

Dr Reddys,

1010

Colorimtry

Dr Reddys,

1163

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

Dr Reddys,

1329

What are usp limits for total impurities,unknown impurity

Dr Reddys,

1 2921

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

 1111

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

 1209

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?

 1445

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

 1277

A ha tc is actual defination of retention time?

 1054

How to check hplc detecter sensitivity?

Gland Pharma,

1 1470

(0.41)d what is d?

Gland Pharma,

1 2030

How to estimate potassium?

 1 1421

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Un-Answered Questions { Analytical Chemistry }

Principle of single pan analytical balance

4590

what is the disso medium for tropsiun chloride

1793

What is the difference between Discriminating media and DPDM(Dissolution Profile with Different Media)

6862

What is the difference between purge septum flow and column flow in gas chromatography?

1823

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

1209




what is lod and loq ?,why use k2cr2o7 , kcl h2so4 in uv calibration ?,why use benzophenone & caffene acetone in hplc calibration ?,what is leading peak in hplc ?why we do the calibration of limit of stry light in hplc & uv ?

3174

How can I develope method of dissolution by HPLC OR UV

1885

in DMF having extra impurities and in api COA also having extra imp than USP or BP product then how require to proceed?

340

what is the origin to prepare standard operating procedure

1776

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

1010

What is split ratio in Gc? Splitless? how requirr to select?

315

pharma industries oriented

1679

What is the accrptance criteria in RSD for RS method precision on basis of impurity percentages?

300

Why we select scan range from higer wavelength to lower wavelength in uv visible spectroscopy and ftir spectroscopy ? .

450

What is mean by PDR?

320

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