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Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what are peak purity,peak purity index,peak thresold

2 13951

1)why use benzophenon,uracil in hplc calibration. 2)why use sucrose in polarimeter calibration. 3)what is S/N ratio, noise and drift in hplc 4)how we can find lod and loq in method validation

1 12004

What is (Q) point dissolution?

Cipla, Macleods,

6 21304

Why we are using K2Cr2O7 for control of absorbance in UV?

2 11122

1 why polyesterene film used for ftir calibration ? 2 why k2cr2o7 is used for control of abs in uv ? 3 why holmium oxide used for control of wavelength in uv

3 10112

what is the principal of malvern particle sizer & its used in pharma industry

3 6463

what is the difference between system precision and method precision?

Teva Pharmaceuticals,

3 25875

In lcms analysis some times we get sodium and potassium adducts. if the compound is havine sodium ions how can we confirm wether sodium is from sample or it is a adduct?

Teva Pharmaceuticals,

2 5541

what is difference between moisture contents and water contents ?

Cipla, Hetero, USM,

12 49439

In GC, What does 'Column condensation test' mean by?

Reddy Labs,

2 8630

same sample on two preapration gives differnt result during hplc analysis

3 5642

what is titrent,& titrate

Graviti Pharmaceuticals,

2 10864

Why we are using a Kf Factor range 4 to 6

7 42825

What is difference between Chromatographic purity and Related substances analysis?

3 19737

Why we are using the methanol in Kf titration?

Reddy Labs,

6 17046

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Un-Answered Questions { Analytical Chemistry }

what is procedure of actual procedure for registration of drug?


why should we perform dissolution PVT calibration only by UV spectrometer, not by HPLC ?


What is the diference between residual solvents and organic volatile matter


What is the difference between spectro meter and spectro photo meter?


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


A ha tc is actual defination of retention time?


Why we check moisture,ash & AIA in product


what is turbidimetric titration?Give 2 examples.


Why do we use KMnO4 in the test of control of obsorbance ? and why do we take specific quantity i.e 57-63mg?


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?


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?


why are measure gas flow " ml " in Gas chromatography


why glutent are detected in the rice cereal baby food product even manufacturer claimed that they are using rice and milk only?we have using ELISA to do the test,and rice supposed not containing any glutent,rite?We already repeat the test so many times and it still detected.just wondering where the glutent came from?