Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

How to calculate the signal to noise ratio.

Rakshit Drugs,

1 6530

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

IPCA, Lincoln Pharmaceuticals,

3 7939

Weight balance variation limit during analysis

Amneal Pharmaceuticals,

7 8274

How to calculate lamp energy in hplc?

1 3238

Difference between related substances & impurities

Biocon,

2 17054

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

1 3084

Basic principle of ESI?

Cipla, GVK,

1640

What is the meaning of Base deactivated vials

Sun Pharma,

1 2745

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

2 8872

What is the definition of RRF

2 5761

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

Gland Pharma,

1 3123

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

Cipla, Dr Reddys, FDC,

3 12286

What is difference between assay by Hplc and uv

Aizant, Fredun Pharmaceuticals, Hetero, Marksans Pharma,

2 9230

why we use actone for Gpv test in hplc calibration

1 9298

How to standardization of 1N H2SO4?

GNFC, Macleods,

1 7048


Post New Analytical Chemistry Questions

Un-Answered Questions { Analytical Chemistry }

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

2137


How can I develope method of dissolution by HPLC OR UV

1891


What is the purpose of octyl silane columns?

3781


in each media we require to use SLS? how to proceed?

290


1)What's the meaning of Absorption,give a example. 2)What's the meaning of Adsorption,give a example. 2)what is the difference between Absorption and Adsorption.

2421






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?

2973


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

304


what are the guidelines for analytical method validations?

591


How to choose the which salt is suitable for mobilephase

2644


how require to select dissolution media? what is discrimination?

309


WHAT IS THE PARAMETER FOR THE SELECTION OF MOBILE PHASE IN HPLC?

639


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

1622


how to decide for one product require water content or LOD?

323


Why we check moisture,ash & AIA in product

1397


Why we select scan range from higer wavelength to lower wavelength in uv visible spectroscopy and ftir spectroscopy ? .

454