Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what is dwell volume in HPLC?

Aurobindo, Cadila, Strides, Sun Pharma, SUN,

2 4255

what does pH stand for?

Orchid,

4 4285

Definition of beers_ lamberts law

Emcure, Aarti Industries, Agio Pharmaceuticals, Supriya Lifescience,

4 3496




Why monograph of hplc coming upperside of drift but in IR monograph coming in drift side?

1 1978

Why a1% value is used for some product ? What is the criteria for selection a1% value ?

Zim Laboratories,

1019

Why the ph limit (1_14) Is used?

Cipla,

3 4521

What is cut off value of solvent used in hplc

Pfizer,

1 3536

How to calculate mass balance in RS after degradation

Reddy Labs,

1 2711




if out of two set of results of moisture analysis first 1 is passing, second one is failing, is it oos ? or vice a versa first 1 is failing and second one is passing. for information mean value to be reported and in mean value the substance is ppassing, is it oos or normaal mean value to be considered?

JBCPL,

1 1628

Can we interpret accuracy from linearity in method validation?

Dr Reddys, Lupin,

802

What is aggregate and fragments in SEC?

703

how pyridine can be analysed other than GC?

1 2080

What is the calibration of uv process and preparation

Aurobindo,

757

How to prepare 1000ppm methylene blue solution

2 4476

Identify problem faced when mass spectroscopy is used with HPLC system ?

College School Exams Tests,

733


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Un-Answered Questions { Analytical Chemistry }

Why perchloric acid used for potentiometric titration

1360


what is third integration

759


How would you decide dissolution medium for NCE compound of class I drug

786


AT WHAT CONDITIONS WILL YOU ANALYSE A SAMPLE,WHICH ARE PRESERVED AT OTHER THAN THE AMBIENT CONDITIONS?(ie COLD STORAGE SAMPLES BELOW 20* CENTIGRADE?

894


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.

829






pharma industries oriented

887


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

1063


Tell me about analytical method validation in QC

2122


What is importance of pH in the Heavy metal test and How it effect on the test results?

1006


What is the main difference between ODS1 and ODS2 Hplc column.

2048


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

2629


1.What is the difference between method validation and method verification 2.Which guidelines proposed to method transfer

310


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?

2136


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

2259


How do we quantify crystaline and amarpous forms by using (NMR, XRD)spectroscopic techniques? Which any others instruments are useful for this quantification? explain

1211