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Analytical Chemistry Interview Questions
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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,

838

why we use polystyrene film for ftir calibration?

Rakshit Drugs,

4 10608

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

GVK,

1292



why do we adjusted ph in the mobilphase

Cipla, Reddy Labs, Dr Reddys,

9 15771

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

2 5307

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

 6 8154

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 4920

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

 1 4821





 963

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

 3 6474

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

Medley Pharmaceuticals,

2 5729

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 2969

What is Arsenic Test?

Flamingo Pharmaceuticals,

1105

What is the difference between Optical rotation and Spcefic optical rotation

IPCA, Matrix,

2 7924

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

Lee Pharma, Aurobindo,

4683

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Un-Answered Questions { Analytical Chemistry }

A ha tc is actual defination of retention time?

146

what is the procedure for cleaning of lenses of hatr accesory of ftir instrument?

979

how to get accurate result for Residue on evaporation in purified water

194

what are the standard methods for HPLC?

1408

can we use the same detector in HPLC as well GC and what could be the differences we can find in the final chromato graph in any aspects?

822




in gas chromatography what is the difference between gas flow rate and average linear velocity ?

929

how a particular wavelength can be different for a particular compund while analysing by uv and by HPLC.

1012

Describe your field experience sample type collected,sample techniques,field measurements taken and equipment used?

1370

How much is the standard area for glc analysis

855

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

12

Why to use propyl paraben in HPLC gradient calibration

153

what is the purge flow & how to calculate

1097

Why do we use KMnO4 in the test of control of obsorbance ? and why do we take specific quantity i.e 57-63mg?

1190

how much mass should be there in volumetric flask while in preparation of sample for assay? 

1063

What are modes of quantification in related substances

801

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