Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

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.

1521

If i performing one analysis on C8column then the same analysis done on C18 column then what will happen about Rt;Resulution;Peak shape Explain ?

1 5266

what is peak purity? how may types of methods to determine peak purity?

Mylan,

3 9597




why using Potentometry What Purpose? differance between manual and potentiometry? why using Some of materials in usig potentiometry? What is use of mericuric acetate in Potentiometry

Biocon,

1 2842

iam using ph instrument lab india make.3ponit and 5point.in calibration time 3point slope will come 98.89and 96.87.that limit is 85 to 105.what basis slope will come.any calucalation between them.5point wiicome slope 99.89?why 3p0int came 2 values

1 2861

iam usig ph buffers merk. manually how to prepare ?

910

Sulphated Ash incresed it will effect on product yield?

Biocon, Lupin,

1 1971

in loss on drying Why follows on constant weight not more than 0.5 mg, any region

Biocon,

1 8221




difference between selectivity and specificity

Troikaa Pharmaceuticals,

2 9603

when we talk about change in entropy we consider total entropy means of surround +entropy of system but when we talk about change in Gibss free energy we consider entropy of system.explain with reason.

ABC,

710

differnc btw c18 and c-8 column

Cipla,

3 8994

use of stry light

1 4629

when we have polar type of sample and solvnt hen which type of stationry phase we have to use

3 3980

what is motor rotation in case of sucrose

1 1623

why equlirium conatant of water have 14 value

GVK Biosciences,

838


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Un-Answered Questions { Analytical Chemistry }

How to determine water content of bis tetrazole amine mono ammonium salt

1792


why equlirium conatant of water have 14 value

838


In HPLC (Waters) software Empower1,2 &3 what is the updation for each version

1305


We use Potassium Dichromate solution for the calibration of UV-Visible Spectrophotometer in UV region. My question is to calibrate visible region which solution could be used in photometric accuracy

7


What is importance of pH in the Heavy metal test and How it effect on the test results?

863






if you have given a blank water how you analyse by general analytical techniques?

626


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

127


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

114


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

486


what type of question will ask in the interview of lab chemist.

2015


AT WHAT CONDITIONS WILL YOU ANALYSE A SAMPLE,WHICH ARE PRESERVED AT OTHER THAN THE AMBIENT CONDITIONS?(ie COLD STORAGE SAMPLES BELOW 20* CENTIGRADE?

755


using gradient pressure in gas chromatography are not ?using gradient pressure why

2047


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?

1941


Did anybody have method for acetyl cysteine effervescnce tablet

818


Qc interview questions

238