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Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

How to calculate the signal to noise ratio.

Rakshit Drugs,

1 5528

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

IPCA, Lincoln Pharmaceuticals,

3 6628

Weight balance variation limit during analysis

Amneal Pharmaceuticals,

7 6002

How to calculate lamp energy in hplc?

1 2361

Difference between related substances & impurities

Biocon,

2 11384

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

1 2331

Basic principle of ESI?

Cipla, GVK,

1195

What is the meaning of Base deactivated vials

Sun Pharma,

1 1944

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

2 6154

What is the definition of RRF

2 4634

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

Gland Pharma,

1 2220

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

Cipla, Dr Reddys, FDC,

2 8899

What is difference between assay by Hplc and uv

Aizant, Fredun Pharmaceuticals, Hetero, Marksans Pharma,

2 7797

why we use actone for Gpv test in hplc calibration

1 7503

How to standardization of 1N H2SO4?

GNFC, Macleods,

1 5711


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Un-Answered Questions { Analytical Chemistry }

How to choose the which salt is suitable for mobilephase

2115


Explain the relations between number of carbon atoms in alkanes and retention time ?

1084


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?

1536


if you have given a blank water how you analyse by general analytical techniques?

1067


when we talk about change in entropy we consider total entropy means of surround +entropy of system but when we talk about change in Gibss free energy we consider entropy of system.explain with reason.

1101






A ha tc is actual defination of retention time?

580


why octanol used to determine the partition coefficient ?

1406


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?

2451


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

1727


what is %labelled amount in content uniformity of dosage unit and its calculation?

4078


using gradient pressure in gas chromatography are not ?using gradient pressure why

2492


what is the importence and role of LCMS and LCMS/MS and their applications? which type of compounds are analysis by lcms?

2665


function of detecter in hplc ,gc and spectroscopy? function of carrier gas in gc?

1523


How they found 1mL of K.F reagent is equivalent to 5mg of water and if we change the composition of K.F reagent, is it can neutralize more amount of water?

758


in dissolution why pool sample needed? in which type of drug pool sample need?

2170