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Chemistry Interview Questions
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Dear sir, This is R.Kadambavadani working in a pharma industry. while doing RS analysis of ibuprofen API, unknown peak eluting some times in the 0.6 Min RT. Kindly send me what is the exact reason behind that. also am using ACN the mobile phase.

 1 1800

What is difference between chemical Assay and Hplc assay?

Lee Pharma,

2 4043

Near infrared Principle

 1 1902

please explian me about area normalisation method,diluted standard method,impurity vs impurity and which one has to be selected in method development

Pfizer,

1090

What is the difference between volumetric solutions and test solutions

Hetero,

2552

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?

 1288

How can we calculate offset value pH measurment

Dr Reddys,

1053

What is stray light in uv what are units for stray light

Dr Reddys,

1006

Colorimtry

Dr Reddys,

1159

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

Dr Reddys,

1327

What are usp limits for total impurities,unknown impurity

Dr Reddys,

1 2917

what is allowable limit Of stray light for a spectrophotometer laboratory instruments ?

 979

I want to ask the inventions of the maxwell boltzmann theory of gases?

 1054

Find out how to make artifacts the maxwell boltzmann theory of gases.

 1 1340

Find out how to make artifacts the maxwell boltzmann theory of gases . ps. I don't speak English that well

 989

Un-Answered Questions { Chemistry }

Q1. Why did you enter the field of chemistry? Q2. What has motivated you to take chemistry as your professional subject and have you motivated anyone towards your field?

1801

What is the principle of HPLC, GC, LCMS, GCMS,LC QQQ, GC QQQ, LC Q TOF and GC Q TOF. What are the applications and Specificity?

8296

what is mean by 40 in the dissolution basket mesh size?

275

what is mean by covalidation

306

How to choose the which salt is suitable for mobilephase

2633




Define a hydrogen bond?

623

What is the difference between the photochemical reaction and photo-dynamic reaction?

2102

what is definition of validation? which components are followed give detail?

1819

for inorganic molecules require to do RS, Assay and disso?

240

What is the process for the removal of salts from brackish water or seawater to make it usable?

571

how much mass should be there in volumetric flask while in preparation of sample for assay? 

2043

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?

2957

How to find peaks in ftir chromatography

1054

What is electrode potential? : Electrochemistry Corrosion

576

What is photoelectric colorimeter?

619

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