Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

How can you prepare 0.1% Phosphate buffer solution?

6 8084

wat is the role of michelson interferometer in FTIR and He-Ne lase.detailed answer required in simple language

Police Constable,

1 1073

difference between quality and quantity

3 8996




why we get only one peak in assay by hplc but in rs by hplc get more peaks

MSN Pharma,

1 8657

In performance Check of GC Why Hexadecane Peak is Considered 

MSN Pharma, Asian Paints,

1752

Is it required to inject 6 injections for % RSD of a system suitability in lc or gc

Raks Pharma,

3 8990

Why do we use KCl ,K2Cr207,Toulene & Halonium oxide for the caliberation of UV

Apotex,

2 12834

what is rt and rrt? how we find rrt? relation between rt and rrt/

Cadila,

1 11649




why the ph scale range is 1 t0 14 and why not beyond 14 and not to below 1?

Orchid, Granules, Avra,

5 16993

What is method validation in quality control

Alchem,

2381

Why we use uracil and caffeine in hplc calibration

Alchem, Reddy Labs,

4 19850

If mass balance is not passing in forced degradation in method validation that method is suitable or not?

Dr Reddys, Reddy Labs, Aurobindo, Wockhardt,

1 5970

Why we compare unequal concentrated solutions in heavy metals test. For example comparing the test solution with 1 ppm lead standard and telling it's less than 20ppm?

Micro Labs, Mistair,

1 5826

What is the reason for negative peak in HPLC while using UV detector.

2 12319

What is the reason of RT change in new column v/s old column in HPLC

Apex,

3 13966


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Un-Answered Questions { Analytical Chemistry }

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

1071


why sre you used Potassium hydrogen phthalate in standarisation of 1N NaOH and 0.1 N Perchloric Acid?

6766


process of Diclofenac sodium,IP.

858


Basic principle of ESI?

816


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

540






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?

2032


What is aggregate and fragments in SEC?

626


What is the principle of Thermal conductivity detector and FID?

1400


pharma industries oriented

825


why we use sodium salicylate in uv light calibration at TLC chamber

4848


what is separation techniques.

1320


What is the diference between residual solvents and organic volatile matter

661


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

668


How to choose the which salt is suitable for mobilephase

1653


Why perchloric acid used for potentiometric titration

847