Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what is the moisture content of Disodium hydrogen tartrate. how it can be calculted. as 16.5%

1 6391

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]

1538

sop of a uv visible spectrophotometer double beam elico model

Sun Pharma,

4200




why does the result variation in hplc and gc with same sample ?

Matrix,

4 8083

How will you select mobile phase in HPLC Method Development

3 13772

how to regulate noise in hplc ?

2 6824

why results are variation in same samples analysis in gc and hplc ?

2 6247

why base line not start from zoro in GC Chromatograme.

Merck,

1 6082




What is cleaning validation of rinse and swabe and its limit with caculation formula.

5 6907

what is the difference between c-8 and c-18 column

7 16127

why deutiriated chloroform used in NMR for sample prepration. what reaction takes place.give reasons

1 5320

how do u optimise hplc method

1 5592

How to calculate %w/w and %v/v of a component(or solvent)by NMR

ACME, Vimta Labs,

1 5898

How to prepare 10% HCl from 36.5% HCl solution.

Dr Reddys,

5 99425

How to prepare 50 ppm ammonia solution form 25% ammonia solution?

Cadila, IIT,

8 20928


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Un-Answered Questions { Analytical Chemistry }

WHY given much noise PDA dector then VWD Dector

696


mahagenco syllabus for the post of chemist

4930


What is the diference between residual solvents and organic volatile matter

712


what is the difference between potentiometric titration and karl fischer titration?

1182


iam usig ph buffers merk. manually how to prepare ?

1009






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

1437


My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards

230


In performance Check of GC Why Hexadecane Peak is Considered 

1798


Basic principle of ESI?

866


In dissolution of tablets/capsules elaborate the Dissolution limit 20.0% to 60% Q in 30 minutes.

752


What is Band broading effect explain

598


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

7149


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

1036


Principle of single pan analytical balance

3711


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?

2100