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,

386

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?

432

How can we calculate offset value pH measurment

Dr Reddys,

258




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

Dr Reddys,

303

Colorimtry

Dr Reddys,

276

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

Dr Reddys,

376

What are usp limits for total impurities,unknown impurity

Dr Reddys,

1 866

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

343




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

334

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?

355

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

244

A ha tc is actual defination of retention time?

282

How to check hplc detecter sensitivity?

Gland Pharma,

295

(0.41)d what is d?

Gland Pharma,

1 585

How to estimate potassium?

1 325


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Un-Answered Questions { Analytical Chemistry }

How to start the dissolution development for unknown tab?

364


acceptance criteria for lod & loq by standard deviation of response and slope??

1235


How do we get end points and how many end points are possible for citric acid and di-acid not theorotically answer should be given practically.

1256


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

1286


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

7005






A ha tc is actual defination of retention time?

282


For limit test of heavy metals in BP, Method C require that the substance is ignited at a temperature not exceeding 800 °C. Why confines such the temperature?

2539


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?

432


WHICH STANDARD WE USE IN SILICA ANALYSIS IN SILICA-GEL METHOD FOR SOLID SAMPLE

917


why octanol used to determine the partition coefficient ?

1029


WHAT IS DIFFERENCE B/W MALTINGRANG/DSC

1223


Why Ethanol is Used for Standardization of GC Head space?

2677


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

991


i want model written test paper for the post of analyst in IOCL(indian oil corporation ltd) any one pls help me

1460


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

733