Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

How to calculate the signal to noise ratio.

Rakshit Drugs,

1 6485

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

IPCA, Lincoln Pharmaceuticals,

3 7893

Weight balance variation limit during analysis

Amneal Pharmaceuticals,

7 8197

How to calculate lamp energy in hplc?

1 3188

Difference between related substances & impurities

Biocon,

2 16987

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

1 3055

Basic principle of ESI?

Cipla, GVK,

1618

What is the meaning of Base deactivated vials

Sun Pharma,

1 2697

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

2 8807

What is the definition of RRF

2 5713

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

Gland Pharma,

1 3092

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

Cipla, Dr Reddys, FDC,

3 12181

What is difference between assay by Hplc and uv

Aizant, Fredun Pharmaceuticals, Hetero, Marksans Pharma,

2 9187

why we use actone for Gpv test in hplc calibration

1 9233

How to standardization of 1N H2SO4?

GNFC, Macleods,

1 7017


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Un-Answered Questions { Analytical Chemistry }

What is mean by PDR?

302


Why only hydroxy naphthol blue indicator is used for standardisation of 0.05M EDTA solution instead of solochrome Black T or Euriochrome Black T indicator which is used for all sample analysis with 0.05M EDTA solution?

2174


can i use hplc detector to uplc and why?

1792


[3/28, 20:52] Manoj P Venkatpurwar: how many impurities require to inject in assay specificity that how we can find out? and in Rs also how?

325


How to do regeneration of Metacarb Pb plus column?

2055






in monograph 7 imp are there but in vendor showing 5 imp do not req to include 2 imp for that what will be justification?

244


for which product require to do content uniformity? what is limit of cu?

284


Tell me about analytical method validation in QC

5493


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

1160


we can use expired sample for validation and analyst qualification?

277


what is lod and loq ?,why use k2cr2o7 , kcl h2so4 in uv calibration ?,why use benzophenone & caffene acetone in hplc calibration ?,what is leading peak in hplc ?why we do the calibration of limit of stry light in hplc & uv ?

3151


if your impurity coeluting with each other in that situation how require to set specification? is it acceptable?

338


AT WHAT CONDITIONS WILL YOU ANALYSE A SAMPLE,WHICH ARE PRESERVED AT OTHER THAN THE AMBIENT CONDITIONS?(ie COLD STORAGE SAMPLES BELOW 20* CENTIGRADE?

1580


what is the origin to prepare standard operating procedure

1766


How to set specification of assay, fisdolution and related substances?

337