Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

which effect is mainly responsible for chromatographic separation when silica is the statinary phase at TLC? thanks in advance

1 3018

what is different when impergnated silica plates are used in separation of azo dyes using column chromatography?

1432

why in GC calibration of linearity regression coefficient should not be less than 0.999

Acacia, Jubilant,

1 4941

why don't we call POH meter? As we all as PH meter

Aurobindo,

4 7404

Why we are having specification 100% above in case of assay as there is only 100% of compound?

MSN Pharma, Nectar Lifesciences,

2 4789

why we are taking 89ml concentrated HCL for preparing 1N HCL

3 8141

Calculate the water content in Di Sodium Tartrate (DST) based on molecular weight?

3 8736

What are the terms used during Melting Range Analysis ?

2 3421

As per USP u/vacuum means (how much vacuum should be applied)?

Mylan,

1 4926

what is difference between zero air gas and o2 gas

IPCA, Vasudha Pharma,

1 8988

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

2250

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

Hetero,

1652

In which cases factor of KF Reaget got higher side

2 5409

what is the concept for adjustment of pH in HPLC buffer solution ? a. Common ion effect b. Counter ion effect and explain me, how we adapt this principles & what is the role of these principles in our method

Apex, Pentagon Labs,

1 2530

What is the difference between BD

1 2180


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Un-Answered Questions { Analytical Chemistry }

If inhouse hplc related substance method is completly diffrent from Usp for finished pro─Ćuct with diffrent impurities then how require to prove method equivalecy?

236


what is impurity profile. how to interpret this impurity profile to a drug product or drug substance.

2092


how you establish the LOQ?

232


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

1875


IS THERE ANY EQUIPMENT TO CHECK AND CALCULATE THE POLARITY OF A LIQUID?

1910






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?

2241


If vendor having more imp than monograph then how to proceed? and how to set spec?

254


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

2409


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

1652


how we can identify the impurity is coming below loq at transfering site?

299


for inorganic molecules require to do RS, Assay and disso?

176


What is the requirement for brazil in the analytical method vslidation comparr to ich?

200


What is the formula to determine the concentration of M of a solution given the % transmittance? Use %T = 43.7 as an example.

2050


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

2002


what type of question will ask in the interview of lab chemist.

2810