Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what are peak purity,peak purity index,peak thresold

2 11690

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 10557

What is (Q) point dissolution?

Cipla, Macleods,

6 18321




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

2 9835

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 9117

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

3 5579

what is the difference between system precision and method precision?

Teva Pharmaceuticals,

3 20964

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 4753




what is difference between moisture contents and water contents ?

Cipla, Hetero, USM,

12 44166

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

Reddy Labs,

2 7736

same sample on two preapration gives differnt result during hplc analysis

3 4855

what is titrent,& titrate

Graviti Pharmaceuticals,

2 9245

Why we are using a Kf Factor range 4 to 6

7 33449

What is difference between Chromatographic purity and Related substances analysis?

3 17241

Why we are using the methanol in Kf titration?

Reddy Labs,

6 14930


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Un-Answered Questions { Analytical Chemistry }

WHAT IS THE CRITERIA FOR SELECTION OF TIME OF DISSOLUTION AND THE MEDIUM OF DISSOLUTION?

1377


is it necessary to do HPLC calibration at wavelength 315nm if we are doing analysis at this wavelangth

572


we are performed SOR for a particular product the limit is -6 to -10.We face particular bathes it is not meeting the specification.we performed diffrent instrument diffrent analyst we are getting diffrent diffrent results.solvent is dimethyl sulfoxide what could be the reasion

468


What is the principle of Thermal conductivity detector and FID?

1424


EXPLAIN THE CALCULATION PART OF AN KF TITRATOR CALIBRATION WITH SUITABLE EXAMPLE

1325






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

1201


WHAT IS THE USE OF STARTER ?????????

1091


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

1188


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

866


How do we quantify crystaline and amarpous forms by using (NMR, XRD)spectroscopic techniques? Which any others instruments are useful for this quantification? explain

1155


cefoperozone and sulbactam inj. hplc test method

1268


how to select short coloum and long coloumn for new molecule

1024


Basic principle of ESI?

838


How can we calculate offset value pH measurment

209


in dissolution in one tablets two molecule one is losartan & second is HCTZ losartam is complies in s1 stage & hctz is complies in s2 stage then how to report result losartan s1 stage result or losartan s2 stage result

909