Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

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

Dishman,

863

why we use polystyrene film for ftir calibration?

Rakshit Drugs,

4 10903

WHAT IS THE CRITERIA FOR SELECTION OF TIME OF DISSOLUTION AND THE MEDIUM OF DISSOLUTION?

GVK,

1317




why do we adjusted ph in the mobilphase

Cipla, Reddy Labs, Dr Reddys,

9 15992

How to develop the method when we have very low amount of impurity?

2 5406

If we have 120 minutes run time method for HPLC and you wan to decrease the Run time so what should you do??

6 8290

Wath is the differenc between two column HPLC wich have the samme support , lenth , pore size, etc.. But different name .for exemple : Spherisorb / lichrosorb

NDA,

2 5000

WHAT IS PVT TEST IN DISSOLUTION TEST , WHAT IS PVT SIGNIFICANCE AND HOW IT IS PERFORMED ?

1 4912






995

How you will select column for HPLC development depends on nature of compound and how it will work explain in brief?

3 6604

What is the role of SO2,I2, Methanolic hydroxide and any base in Karlficher titration

Medley Pharmaceuticals,

2 5837

The boiling point of 1,3 butadiene is -4.4 DC & the boiling point of Pentane is 36.1 DC. Then how come Pentane elute before 1,3 BD in GC analysis?

1 3030

What is Arsenic Test?

Flamingo Pharmaceuticals,

1135

What is the difference between Optical rotation and Spcefic optical rotation

IPCA, Matrix,

2 8102

why we use sodium salicylate in uv light calibration at TLC chamber

Lee Pharma, Aurobindo,

4758


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Un-Answered Questions { Analytical Chemistry }

function of detecter in hplc ,gc and spectroscopy? function of carrier gas in gc?

1162


What is the diference between residual solvents and organic volatile matter

626


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 ?

1105


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?

1981


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.

824






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

854


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

930


what is procedure of actual procedure for registration of drug?

570


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.

735


What is aggregate and fragments in SEC?

581


what is peak purity and its formula

144


How do we get end points and how many end points are possible for citric acid and di-acid not theorotically answer should be given practically.

1165


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

2245


While performing TOC sst analysis Zero shift disabled & sample analysis zero shift enabled why?

898


WHAT IS THE CRITERIA FOR SELECTION OF TIME OF DISSOLUTION AND THE MEDIUM OF DISSOLUTION?

1317