Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What are the different types of columns used in HPLC

Wockhardt,

2 8413

In HPLC when we use Isocratic method, Gradient method in hplc?

Pharmaceutical,

8 13472

Any molecule is filing for ANDA purpose, what are the dissolution requirements / specifications needed ?

IPCA,

1 3827




What is Endcapped Hplc column

2 6302

Why we more noise in PDA detector compared to UV detector?

Aurobindo,

1 8180

if the purity is 99.9%,is need to do assay?

Reddy Labs,

3 10896

What is the difference between specified impurity and Identified impurity

Glenmark,

3 8953

What is the difference between specified impurity and Identified impurity

Merchant Navy,

1 2474




how do you established the RRF for unknown impurity

Square Pharma,

3 7546

I want analyze my compound at 325 nm so which standard shall i use to calibrate my HPLC system? How i can assure my hplc detector is suitable or not?

AMRI,

2 6235

How we will choose pH of a mobile phase if analyte pKa value is 4

Laurus, Celon Labs,

2 7730

what parameters we will consider while developing a HPLC method and how we confirm our HPLC method is valid?

Laurus, DRL,

2115

Which column is more polar, C8 or C18?

Glenmark, Cipla, Laurus, Torrent Power,

6 19000

what is the difference between heavy metals and sulphated ash

Aurobindo,

2 10697

what is difirence b/w ROI&ROE

Pfizer,

1 6501


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Un-Answered Questions { Analytical Chemistry }

which one is better separation in high pressure liquide chromatogram orlowpressure chromato gram in hplc

858


How will u perform degradation study in detectors other thann PDA in HPLC Methodology

1164


Qc interview questions

240


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

537


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

1607






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

929


what is the disso medium for tropsiun chloride

808


What is the principle of Thermal conductivity detector and FID?

1313


In the isomers,enantiomers give the only physical properties present such that no chemical properties present.

879


Did anybody have method for acetyl cysteine effervescnce tablet

819


What is viod volume and peak purity in HPLC?

1253


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

6549


How to compare XRD graphs against standard and carry polymorpism study of API's by powder XRD method?

2485


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

2224


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

1189