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Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

WHY pKa value is more important than pH value of the mobile phase in HPLC?

736

Many times I don't got a caffeine peak in calibration of hplc using guard column ❓

691

For standardization of volumetric solutions, acceptance limit for concentration is considered as 10% of nominal concentration and %RSD as NMT 0.2% (for appropriate no. of replicates). But , if %RSD has not met, what should be further action?

575

In Assy by potentio metry titration method how select MET U ,DET U, SET U,

633

in sampling of raw material which side is pasted sampled labels

683

why holium oxide prepared in 10% HCLO4 SOLUTION

529

Why 162 mg NaOH used for 1N volumetric solution in 150 ml water then 54.5 ml diluted with 1000 ml

713

What is the importance of rrf in rs by HPLC?

1 1417

Why use only methanol,used determinationof moisture content not use other solvents

301

please explain about aluminium hydroxide assay

289

How to know the estimated LOQ concentration in ppm

244

What is the difference between c8 and c18 hplc column?

256

Why karl fisher factor is 5 ?

1 464

Loss of linearity in tkn analysis, possible reasons?

220

In rs method development when we are going area normalization method to dilute standard method?

300


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Un-Answered Questions { Analytical Chemistry }

What is gelatinization?

801


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

1176


While performing TOC sst analysis Zero shift disabled & sample analysis zero shift enabled why?

1648


We use hicrome 10 cxs column in hplc analysis....pls tell me.. what is the meaning of 10 cxs?

663


why we use Dichlorobenzene.nitrobezine.t-butyldi sulhate.for calibration of gc Head space

1323






How can we confirm the HPLC column is end-capped or not? Is it possible to identify by physical appearance?

2262


How can I develope method of dissolution by HPLC OR UV

1418


what is the principle involved in turbidometry and nephelometry ?

3123


For limit test of heavy metals in BP, Method C require that the substance is ignited at a temperature not exceeding 800 °C. Why confines such the temperature?

2973


In performance Check of GC Why Hexadecane Peak is Considered 

2157


Ratio of Water and Acetonitrile(diluent) is not recommended to use in cleaning method validation,why?

2041


WHAT IS THE PARAMETER FOR THE SELECTION OF MOBILE PHASE IN HPLC?

223


Qc interview questions

819


what is the different in Total ash, sulphated ash, acid insoluble ash, alcoholic or non alcoholic ash?

8274


why equlirium conatant of water have 14 value

1291