Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

How to calculate the signal to noise ratio.

Rakshit Drugs,

1 4580

Why pH range is 1-14 nt more than 14???

IPCA, Lincoln Pharmaceuticals,

3 5101

Weight balance variation limit during analysis

Amneal Pharmaceuticals,

7 4289




How to calculate lamp energy in hplc?

1474

Difference between related substances & impurities

Biocon,

1 6485

Polarized meter calibration, 1. Method name? 2. Which solution use? 3.why?

1 1757

Basic principle of ESI?

Cipla, GVK,

816

What is the meaning of Base deactivated vials

Sun Pharma,

1 1008




What is definition of RRT and what is the difference between RT and RRT in HPLC

1 3042

What is the definition of RRF

2 3666

In GC Why does retention time decrease when temperature increases? Also how does a change in temperature effect selectivity?

Gland Pharma,

1 1245

why we use 0.1% acetone in gradient calibration of HPLC?

FDC, Dr Reddys, Cipla,

2 5832

What is difference between assay by Hplc and uv

Aizant, Fredun Pharmaceuticals, Hetero, Marksans Pharma,

2 5382

why we use actone for Gpv test in hplc calibration

1 5163

How to standardization of 1N H2SO4?

GNFC, Macleods,

1 4133


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Un-Answered Questions { Analytical Chemistry }

What is the principle of Thermal conductivity detector and FID?

1401


Ratio of Water and Acetonitrile(diluent) is not recommended to use in cleaning method validation,why?

1647


Why potassium dichromate is used in calibration of uv?

271


can we use the same detector in HPLC as well GC and what could be the differences we can find in the final chromato graph in any aspects?

897


What are usp limits for theoritical plats,resoution,tailing factor,peak to valley ratio

283






Why perchloric acid used for potentiometric titration

848


How to choose concentration of LOQ solutions for RS analysis? Example.

735


Basic principle of ESI?

816


What is the purpose of octyl silane columns?

2603


A ha tc is actual defination of retention time?

207


what are the standard methods for HPLC?

1484


What is the difference between purge septum flow and column flow in gas chromatography?

760


In HPLC (Waters) software Empower1,2 &3 what is the updation for each version

1391


In IR spectra, generally a molecule vibrates without apply emr or ir light?

536


What is diffrence between extractable volume and deliverable volume? Answer pls

738