Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

Can you please give a suitable definition and an example for understanding the words purity and potency.

Cipla, Reddy Labs, Malladi Drugs and Pharmaceuticals,

6 6135

What is column in chromatography?

Chembond Chemicals,

778

Which Pharmacopiea follow calibration of HPLC,GC

Reddy Labs, Bayer,

3 5895




Why Holium cholorate used in UV Spectro photometer?

Reddy Labs,

7 5822

why we get negative values in uv when i placed sample which has some concetration but not in standard

Nirma,

1 3141

Why water not directed by FID detector 

Amoli Organics, Lupin,

1 3495

what is definition of validation? which components are followed give detail?

884

how the compound separate in coulunm,explain

Wockhardt,

1000




What is the principle of HPLC?

Cipla, Lupin,

3 6030

Why methanol & acetonitrile is mostly used for hplc analysis?

DRL,

2 9160

Explain about empower software of analysing?

DRL,

1 3439

why we use Dichlorobenzene.nitrobezine.t-butyldi sulhate.for calibration of gc Head space

Raks Pharma,

916

Why use the Omeprazole as a reference standard to estimate the assay of esomeprazole by HPLC method

Student,

1 2220

are there in uv lamb that is chractrestic for wavelenghth 205 nm ?????

Beni Suef University, Sri Krishna Pharmaceuticals, Graviti Pharmaceuticals,

697

In UV calibration we use Holmium perchlorate solution made in 1.4M perchloric acid The question is that 1.4 M perchloric acid we make is it in water or glacial acetic acid?

4 6121


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Un-Answered Questions { Analytical Chemistry }

why we use a particular hplc column for a particular compound give reasons?please

1491


What is control room temperature and which guide line says?

330


why lactose has less charges when packed in steel containers when compared with packing of lactose in polyamide material?

942


process of Diclofenac sodium,IP.

860


what is the disso medium for tropsiun chloride

884






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 ?

1137


Why to use propyl paraben in HPLC gradient calibration

450


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

1282


cefoperozone and sulbactam inj. hplc test method

1248


What is aggregate and fragments in SEC?

628


what is the importance of peak purity in HPLC and how we can calculate through manul(not software)?

3070


how will you do the prep for unstable componds?

645


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.

760


Basic principle of ESI?

817


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

455