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Chemistry Interview Questions
Questions Answers Views Company eMail

What is the reason for negative peak in HPLC while using UV detector.

 2 15905

What is the reason of RT change in new column v/s old column in HPLC

Apex,

3 18182

What is the difference between kf  and LOD

Enaltec Labs,

5 22501

What is chiral and why this performing in HPLC

Hetero, Macleods,

4 20679

why we not use caffeine at 205nm for hplc calibration?

Alkem Labs,

3318

why we use 254nm for caffeine analysis as it having maxima at different wavelength?

Ahlcon Parenterals, Alkem Labs,

1 5185

whenever kf titration is done that time one result is high and second one lower  results what to do.

Invochem Laboratory, Laurus,

2 5574

What are the inorganic material eliminated in Sulphated Ash

Cipla,

3345

How to Calibrate NMR instrument ?

Reddy Labs,

1 5484

what is difference b/w spectroscopy, Spectrometry and Spectrophotometry ?

Reddy Labs,

1 12217

Hello Dear all; I have a technical question related to analytical Chemistry, I have a sample of (40% w/w) Ferric Chloride solution (for water treatment purposes which consist a little portions of Ferrous Chloride and Hydrochloric acid. I need to know the methods to determine the percentages of each Ferrous Chloride and Chloride acid. Also I want to make sure that this solution is truly (40% w/w). So ANY CLUE !!! Thanks in advance.

 2 4742

What is the meaning of 624 in DB-624 Capillary column used in GC?

Aurobindo,

5 28521

In Agilent HPLC calibration using Empower 3 Software, What is the criteria for GPV Baseline starting point? i.e., Either it can start from -0.00/+0.00 or any range is there like -0.05 to +0.05 or ......etc?

Apotex,

1 7115

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

Reliance,

3395

What is the difference between STANDARDIZATION and CALIBRATION of instrument like KF? why do we standardization of KF everyday? Why the KF factor being only 5.02 etc? 

AlpaMed, Vergo pharma research,

5 30595

Un-Answered Questions { Chemistry }

How can I develope method of dissolution by HPLC OR UV

2414

What is intact assay method development.....?

2673

What is the min constitutes of haematite ore?

1092

What is an indicator electrode?

1299

in OSD forms require to use gas chromatography?

842

What is the chemical composition of fat in human body?

1127

Which is the best conductor of electricity?

1038

how many types of balance calibration test?

2309

Suppose we prepared pH buffer solution in lab.and calibrate against NIST solution, and same shall going to used upto 30 days. is it possible to stable pH and appearance? suggest?

1901

How to set analyticl specification for combination products?

756

in which situation ion pair require to use?

830

pharma industries oriented

2254

How doing qbd practically?

980

Which organic compound is used as a fuel in jet air crafts?

1254

if your product is soluble in 0.1n hcl and water then which you choose as media from these 2 media?

686

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