Analytical Chemistry Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

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 3898

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

2024

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

Acacia, Jubilant,

1 6196

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

Aurobindo,

4 9280

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

MSN Pharma, Nectar Lifesciences,

2 6041

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

3 9817

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

3 10945

What are the terms used during Melting Range Analysis ?

2 4516

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

Mylan,

1 6115

what is difference between zero air gas and o2 gas

IPCA, Vasudha Pharma,

1 10088

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

2867

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

Hetero,

2164

In which cases factor of KF Reaget got higher side

2 6588

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 3495

What is the difference between BD

1 3196

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Un-Answered Questions { Analytical Chemistry }

why xterra column require to use at higher ph?

920

what is classification of elemental impurities? what is risk assement in elemental impurities?

760

what is the importance of peak purity in HPLC and how we can calculate through manul(not software)?

4489

for heavy metal test lead used in which form pure form or any other form for preparation of lead standard sol

6071

how many types of balance calibration test?

2301

In rs method development when we are going area normalization method to dilute standard method?

1524

How to compare XRD graphs against standard and carry polymorpism study of API's by powder XRD method?

3864

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

2729

Why we used in n-butyl acetate water content terminology while in ethyl acetate we used moisture content terminology?

1858

Why to use propyl paraben in HPLC gradient calibration

7488

how you fix the limits of impurities?

837

WHY pKa value is more important than pH value of the mobile phase in HPLC?

1769

Why only 1.2 million lux hours require in photostability study?

1037

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

1708

if instrument calibration fails then what require to do?

980

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