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,

324

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?

352

How can we calculate offset value pH measurment

Dr Reddys,

207




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

Dr Reddys,

241

Colorimtry

Dr Reddys,

221

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

Dr Reddys,

301

What are usp limits for total impurities,unknown impurity

Dr Reddys,

1 653

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

280




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

252

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?

310

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

193

A ha tc is actual defination of retention time?

226

How to check hplc detecter sensitivity?

Gland Pharma,

233

(0.41)d what is d?

Gland Pharma,

1 464

How to estimate potassium?

1 241


Post New Analytical Chemistry Questions






Un-Answered Questions { Analytical Chemistry }

Principle of single pan analytical balance

3656


why 6 tablets use for dissolution

1875


acceptance criteria for lod & loq by standard deviation of response and slope??

1185


How to calculation of residual solvent methanol (3000 ppm) standard solution, and how many quantity used of test sample

1094


Why do we use KMnO4 in the test of control of obsorbance ? and why do we take specific quantity i.e 57-63mg?

1301






are there in uv lamb that is chractrestic for wavelenghth 205 nm ?????

713


How to compare XRD graphs against standard and carry polymorpism study of API's by powder XRD method?

2563


Why Ethanol is Used for Standardization of GC Head space?

2612


Why only hydroxy naphthol blue indicator is used for standardisation of 0.05M EDTA solution instead of solochrome Black T or Euriochrome Black T indicator which is used for all sample analysis with 0.05M EDTA solution?

1010


How can I develope method of dissolution by HPLC OR UV

969


how to calibrate hplc & gc

3105


why octanol used to determine the partition coefficient ?

972


Why a1% value is used for some product ? What is the criteria for selection a1% value ?

958


can i use hplc detector to uplc and why?

944


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

241