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 2649

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

1 962

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

Micro Labs, Medley Pharmaceuticals,


what is the difference between EP and BP

Novartis, Vimta Labs,

2 13321

which detector is used in IR


3 10802

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

DRL, Hetero, MSN,

1 4851

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 6589

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 5536

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?


Hplc detect how much ppm solutions i want range

4 7106

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

2 4936

In kf constant term 16 what it is explain ?

2 5582

Why dissolution apparatus having 8 jars ?

5 9360

What is the unit of Colour?


4 6687

who is the father of HPLC?

IPCA, Cipla,

6 13815

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Un-Answered Questions { Analytical Chemistry }

why sre you used Potassium hydrogen phthalate in standarisation of 1N NaOH and 0.1 N Perchloric Acid?


from where i get mortar pastle for glass bottle crush? it's required for testing of it?


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?


some product having water content method with pyridine and ethylene glycol mixture instead of methanol? how they are selecting and methanol is not suitable solvent how ?


How we performed the force degradation for drug substance, is any specific guideline is available for each parameter(Acidic, basic, oxidation,heat)? what conditions you mentained for above parameters.


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


why 6 tablets use for dissolution


Basic principle of ESI?


What is the principle of Thermal conductivity detector and FID?


What are modes of quantification in related substances


Why to use propyl paraben in HPLC gradient calibration


In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?


Explain the relations between number of carbon atoms in alkanes and retention time ?


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


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