Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

Please do not join if u got offer in oncotherapies ltd (STRIDESARCOLAB)especially Mr.Mahesh Bhatt team because job is not secure his team and doesn't have confidence on him becareful this offer?

Strides Arcolab,

1 2619

In partical size by malven,which parameter is generlly change for development of dry and wet method.

1 933

As per ICH related substances stability trend limit from initial to shelf life

Micro Labs, Medley Pharmaceuticals,

1700




what is the difference between EP and BP

Novartis, Vimta Labs,

2 13100

which detector is used in IR

Hetero,

3 10719

why hexadecane is used in calibration of FID IN GC THERE IS NO REMAINING SOLVENTS

DRL, Hetero, MSN,

1 4749

WHY POTASSIUM HYDROGEN PTHALATE IS USED FOR PERCHLORIC ACID? What is difference btw UV detector & RID detector? what is dissolution? What is unit of KF? what is the significant of pH in HPlc?

1 6475

what is dissolution What is unit of KF? what is the significant of pH in HPlc? WHY POTASSIUM HYDROGEN PTHALATE IS USED FOR PERCHLORIC ACID? What is difference btw UV detector & RID detector?

1 5473




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?

2032

Hplc detect how much ppm solutions i want range

4 7048

If we change lenght of ph eletrode wire then it will affect on ph ?

2 4881

In kf constant term 16 what it is explain ?

2 5511

Why dissolution apparatus having 8 jars ?

5 9233

What is the unit of Colour?

IPCA,

4 6623

who is the father of HPLC?

IPCA, Cipla,

6 13654


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Un-Answered Questions { Analytical Chemistry }

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

1647


Colorimtry

205


what is the limit for KF Factor ,we take factor using water we will found factor between 6 to 7 ,while on KF Reagent bottle mentioned 5 mg/ml water content.if we not use dried methanol it is effect on factor.

684


Please tell me about the pH of Polycaboxylic ether is it in the 5-6 range ever or more than 6

1295


In IR spectra, generally a molecule vibrates without apply emr or ir light?

535






What is the difference between known and unknown impurities?

239


1)What's the meaning of Absorption,give a example. 2)What's the meaning of Adsorption,give a example. 2)what is the difference between Absorption and Adsorption.

1105


How to do regeneration of Metacarb Pb plus column?

1249


In GC calibration,what is the procedure to calibrate the TCD (thermal counductivity detector)suggest ?

1913


HI,I CLEARED BOB CLERK EXAM. MY INTERVIEW WILL BE ON 9TH OCTOBER,2010.PLEASE SEND ME INTERVIEW QUESTIONS AND ANSWERS. THANK YOU.

959


My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards

179


In performance Check of GC Why Hexadecane Peak is Considered 

1752


which one is better separation in high pressure liquide chromatogram orlowpressure chromato gram in hplc

916


function of detecter in hplc ,gc and spectroscopy? function of carrier gas in gc?

1187


In Karl Fischer titration,What is the situation if the material tested is only soluble in water,and not soluble in the common solvents used such as methanol ?? [e.g. Iron III Hydroxide polymaltose]

1474