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 1472

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

605

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

Jubilant, Acacia,

1 3025




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

Aurobindo,

4 4218

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

MSN Pharma, Nectar Lifesciences,

2 2837

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

3 5003

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

2 2557

What are the terms used during Melting Range Analysis ?

2 1659




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

Mylan,

1 2748

what is difference between zero air gas and o2 gas

IPCA, Vasudha Pharma,

1 5456

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

859

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

Hetero,

859

In which cases factor of KF Reaget got higher side

2 3376

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,

1002

What is the difference between BD

664


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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?

757


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

1292


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

1215


Qc interview questions

241


calibrtion procedue of LC-MS

1174






how to select short coloum and long coloumn for new molecule

923


How to decide assay range for non pharmacopeial API analysis by HPLC? Could you give me any reference for same e.g Guidelines or Paper publications?

1776


Why only Copper standard is used to calibrate Atomic Absorption spectrophotometer?

1139


Why potassium dichromate is used in calibration of uv?

180


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

489


how can give the expiry period and restadardisation of volumetric solution

1211


what is separation techniques.

1269


How can the GC or HPLC method is selected to determine the impurity profile in drug product?

5247


why octanol used to determine the partition coefficient ?

896


are there in uv lamb that is chractrestic for wavelenghth 205 nm ?????

646