Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

Why we use caffeine for HPLC calibration in Detector wave ength accuracy test

Reddy Labs, Aurobindo, Cipla, Arvind, Shasun Chemicals,

59 134057

Why we use holmium oxide,perchloric acid for uv/vis calibration

Cipla, Ratiopharm, Orchid,

4 18703

Why Deuterium lamp is used as UV light Source for UV.

4 12125

What is principle of Polarimeter?


21 60987

What is unit of KF?


7 30787

what is principle of XRD?


3 20786

What is unit of pH?

26 33233

How to calibrate glassware against std calibrated glassware?

Cadila, Hetero,

3 9026

One pH means how much volts and milivolts?

Dr Reddys,

7 20548

Why sodium lamp is used as source of Polarimeter?

NCL, Zydus Cadila, College School Exams Tests, Hetero,

12 40427

why there is a need of optical activity & specific optical activity measurement by polarimeter


6 8232

What is normality


12 15306

what is principal of karl ficher instrument!

Alkem Labs, USV,

12 25990

How many clauses in ISO!

1 8712

Why 10%,20%,30% Sucrose solution is used for the calibration of polarimeter?

Cipla, LGC Promochem,

5 18007

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Un-Answered Questions { Analytical Chemistry }

what is %labelled amount in content uniformity of dosage unit and its calculation?


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.


Tell me something about Vitamin A test method by HPLC


Why sodium hydroxide used for maintain pH of phosphate buffer


how can delete the impurity in 1-(2:6 dichloro phenyl)-2-indolenone.and desolving the impurity in which solvent but does not desolve product in solvent.


iam usig ph buffers merk. manually how to prepare ?


What is the meaning of Base deactivated vials


Principle of single pan analytical balance


in dissolution in one tablets two molecule one is losartan & second is HCTZ losartam is complies in s1 stage & hctz is complies in s2 stage then how to report result losartan s1 stage result or losartan s2 stage result


how will you do the prep for unstable componds?


How to calculation of residual solvent methanol (3000 ppm) standard solution, and how many quantity used of test sample


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


If we do accuracy at same concentration at which linearity planned,what is the need to do linearity separately?


what is the structure of DOWEX-50


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