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Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

please explian me about area normalisation method,diluted standard method,impurity vs impurity and which one has to be selected in method development

Pfizer,

717

How they found 1mL of K.F reagent is equivalent to 5mg of water and if we change the composition of K.F reagent, is it can neutralize more amount of water?

805

How can we calculate offset value pH measurment

Dr Reddys,

611

What is stray light in uv what are units for stray light

Dr Reddys,

627

Colorimtry

Dr Reddys,

703

What are usp limits for theoritical plats,resoution,tailing factor,peak to valley ratio

Dr Reddys,

774

What are usp limits for total impurities,unknown impurity

Dr Reddys,

1 2028

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

698

Why acetonitrile and water are used as extraction solvent when analysis melamine? I thought they are miscible and won't be able to separate...

730

In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?

965

could negative ions be produced by bombardment process in mass spectrometry?

649

A ha tc is actual defination of retention time?

617

How to check hplc detecter sensitivity?

Gland Pharma,

672

(0.41)d what is d?

Gland Pharma,

1 1245

How to estimate potassium?

1 798


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Un-Answered Questions { Analytical Chemistry }

In HPLC (Waters) software Empower1,2 &3 what is the updation for each version

1889


How to calculate coreletion coefficient

648


In IR spectra, generally a molecule vibrates without apply emr or ir light?

986


EXPLAIN THE CALCULATION PART OF AN KF TITRATOR CALIBRATION WITH SUITABLE EXAMPLE

1704


What is the Formula for coreletion coefficient in plhplc calibration

674






How you develop a method in HPLC?

1687


What is the difference between c8 and c18 hplc column?

281


What is a difference between potency and purity?

108


How can we calculate "confidence interval" in analytical method validation? Pl. explain with example.

3052


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

1439


why are measure gas flow " ml " in Gas chromatography

757


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

1393


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 ?

1578


How to know the estimated LOQ concentration in ppm

264


what is the purge flow & how to calculate

1575