Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

When i inject amines and acid on HPLC then which peak will elut first?

Sun Pharma,

4 8668

In pharmacopeal solibility parameter of a material, is et essential to test all paramete? If 70-75% parameter passes can we assess that the material is satisfactory or not?

Aurobindo,

1 3035

Why triethylamine and o-phosphoric acid used while setting pH of mobile phase during HPLC Analysis?

Hapten Healthcare, Pharmaceutical,

6 21065




why RID detector is used for selective materials like Mannitol, Hydroxyethyl Starch and Sorbitol?

5 6906

for which type of applications gas chromatography is used?

2 3821

for which type of applications gas chromatography is used?

2 3803

for which type of applications gas chromatography is used?

Cipla, Flamingo Pharmaceuticals,

5 6994

wat is reverse phase in hplc

2 5798




For Dissolution test why we are Performing 6 Bowls why not more.any were mentioned or in what basis we are performing? --------Veerabhadrarao.M

Lee Pharma, Micro Labs,

2 8048

In Number of Theoretical Plates (N) = 16 (tr/w)2. where tr: retention time, and W: peak width. My Question is here in formula what is 16.Can u explain briefly? ---Veerabhadrarao.M

Sun Pharma, Micro Labs, Richter Themis,

3 13342

how to Calibrate FID IN GC

1 4799

what is assay in hplc

3 7476

how calibrate the hplc detector

Cipla, Shraddha Analytical Services,

2 7453

why we use deturium lamp in uv spctrophotometer other than lamps

1 7197

A new drug substance found fail to meet specification for an unknown Impurity during stability study(Specific change),how would further proceed?

2 4330


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Un-Answered Questions { Analytical Chemistry }

Why sometime potassium ortho phosphate mix with acetone use for sample preparation for hplc

194


4. Describe the operation of the Craig apparatus. Chapter.3 Equilibrium Processes in Separations

1222


In performance Check of GC Why Hexadecane Peak is Considered 

1722


In dissolution of tablets/capsules elaborate the Dissolution limit 20.0% to 60% Q in 30 minutes.

678


what are the standard methods for HPLC?

1445






What is the main difference between ODS1 and ODS2 Hplc column.

1623


what is the importence and role of LCMS and LCMS/MS and their applications? which type of compounds are analysis by lcms?

2245


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?

268


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

929


Identify problem faced when mass spectroscopy is used with HPLC system ?

635


why 6 tablets use for dissolution

1806


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

183


What are modes of quantification in related substances

838


Why Ethanol is Used for Standardization of GC Head space?

2563


In BP2013, Loperamid HCl monograph. Assay by titration with 0.1N sodium hydroxide using hydrocloric acid 0.01N and reading the volume added between the 2 points of inflexion. I have a question that if the diluent solvent is ethanol is certainly consumed a amount of volume of titrant, so this volume must be eliminated on the result calculation or not apart from first point which is subtracted above.

1550