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,

412

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?

462

How can we calculate offset value pH measurment

Dr Reddys,

285




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

Dr Reddys,

331

Colorimtry

Dr Reddys,

305

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

Dr Reddys,

413

What are usp limits for total impurities,unknown impurity

Dr Reddys,

1 1009

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

396




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

381

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?

412

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

278

A ha tc is actual defination of retention time?

312

How to check hplc detecter sensitivity?

Gland Pharma,

339

(0.41)d what is d?

Gland Pharma,

1 656

How to estimate potassium?

1 360


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Un-Answered Questions { Analytical Chemistry }

1)What's the meaning of Absorption,give a example. 2)What's the meaning of Adsorption,give a example. 2)what is the difference between Absorption and Adsorption.

1303


in dissolution why pool sample needed? in which type of drug pool sample need?

1908


what is difference between UV - VISIBLE MODEL NO like 1600,1601,1700 etc ? plz explain me

1296


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

381


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

1027






What is gelatinization?

496


Why only Copper standard is used to calibrate Atomic Absorption spectrophotometer?

1321


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

7097


How to choose concentration of LOQ solutions for RS analysis? Example.

875


if you have given a blank water how you analyse by general analytical techniques?

795


What is the principle of HPLC, GC, LCMS, GCMS,LC QQQ, GC QQQ, LC Q TOF and GC Q TOF. What are the applications and Specificity?

6303


How to determine water content of bis tetrazole amine mono ammonium salt

2077


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

2584


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

412


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

750