Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What is the diference between residual solvents and organic volatile matter

RA Chem Pharma,

661

WHY given much noise PDA dector then VWD Dector

645

How to decide the standard concentration for related substances hplc method

1 997




Why we have to use KBr pellet technology ?

1 905

Why dissolution test performed on six jar?

Mylan,

1 1517

How to determine retention time in Chromatography

Mylan,

2 2551

effect of Ph during analytical run ?

Lambda Therapeutic Research,

1 739

USP methodology, EP methodology, IP methodology, among three if possible to use one methodology for qualify working standard to use USP, EP, IP ? Please explain...

Srini Pharmaceuticals,

531




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

Aarti Drugs,

554

Which is the highly polar and highly non polar column in HPLC?

790

What is the difference between qualitative and quantitative analysis (hplc)

1 1145

what is the difference between potentiometric titration and karl fischer titration?

1056

How NMR spectra can be calibrated in presence or absence of TMS?

1 860

What is Band broading effect explain

Dr Reddys,

539

we are performed SOR for a particular product the limit is -6 to -10.We face particular bathes it is not meeting the specification.we performed diffrent instrument diffrent analyst we are getting diffrent diffrent results.solvent is dimethyl sulfoxide what could be the reasion

Cipla,

455


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Un-Answered Questions { Analytical Chemistry }

how the compound separate in coulunm,explain

1000


What is the acceptance criteria for moisture balance when calibrated with sodium sulfate

679


why are measure gas flow " ml " in Gas chromatography

333


Which products will produce when acetic anhydride reacts with Ter-butanol, Sec-butanol, Iso butanol, Dimethylamine etc.

1406


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

1821






What is the formula to determine the concentration of M of a solution given the % transmittance? Use %T = 43.7 as an example.

1288


what type of questions asked on analytical balance and also give answers................all pharma companies?

5970


What is the difference between spectro meter and spectro photo meter?

8407


Describe your field experience sample type collected,sample techniques,field measurements taken and equipment used?

1444


what is the extinction coefficient for Indomethacin or at 319nm wave length.

2531


In performance Check of GC Why Hexadecane Peak is Considered 

1752


How can we calculate "confidence interval" in analytical method validation? Pl. explain with example.

2403


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

308


WHAT IS THE USE OF STARTER ?????????

1071


2. Two grams of Benzoic acid are dissolved in 200 ml of water and extracted with 200 ml of diethyl ether. The distribution coefficient of benzoic acid is 100, and its dissociation constant is 6.5 10-5. Calculate the distribution ratio (D) of benzoic acid at pH 2, 5, and 6. 3. Calculate D at pH 2 to 10 (1 unit apart) in the above problem, and plot D versus pH.

862