Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

when we use pda detector in hplc instead of uv detector

Hetero,

6 16810

why we use holmiumperchlorate in calibrating uv

DRL, Aurobindo, MSN Pharma,

4 12808

why chiral compounds will rotate the plane polarized light in SoR.

GVK,

4 9276




Why sulpuric acid only used to ROI but not used nitric acid and some other acids?

Cadila, Ranbaxy, Laurus,

6 16984

how we do assay of urea, ammonium sulpate, ammonium nitro pospate etc

Alembic,

1 1185

what is difference of uv and pda

MSN Pharma, Akums, Shilpa Medicare, MSN,

13 53938

how can you do the analysis of compound given to u by hplc

1 4764

What is calibration procedure of gredient HPLC pump

4 19896




How to determine water content of thioanisole? which interfere by KF titration?

1 5475

what is dissolution

DRL,

6 17795

What is colimn selection Criteria in HPLC analysis?

4 10907

How to select buffer for HPLC mobile phase

Lupin, Cipla, Cadila,

4 17088

What is primary & Secondary Standard ? Give Example

Lupin, Cipla,

16 142275

Which buffer is used for LC/MS mobile phase & at What Conc.

3 7832

How we fix the validity period of a Normal solution and re-standardization due date

3 5489


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Un-Answered Questions { Analytical Chemistry }

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

812


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.

1186


what is the purge flow & how to calculate

1143


How to calculation of residual solvent methanol (3000 ppm) standard solution, and how many quantity used of test sample

976


what is the disso medium for tropsiun chloride

873






How to check hplc detecter sensitivity?

207


In Karl Fischer titration,What is the situation if the material tested is only soluble in water,and not soluble in the common solvents used such as methanol ?? [e.g. Iron III Hydroxide polymaltose]

1456


Home heating oil or furnace oil what is made from? Can (base oil plus diesel/kerosen) = home heating oil?

835


why 6 tablets use for dissolution

1829


While performing TOC sst analysis Zero shift disabled & sample analysis zero shift enabled why?

940


what is the different in Total ash, sulphated ash, acid insoluble ash, alcoholic or non alcoholic ash?

6856


Why dissolution test is not performed in all of the products

1159


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 ?

1125


Colorimtry

190


What is FFA, PV, and PAV value in oil.

525