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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 15891

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

Apex,

3 18163

What is the difference between kf  and LOD

Enaltec Labs,

5 22481

What is chiral and why this performing in HPLC

Hetero, Macleods,

4 20657

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

Alkem Labs,

3311

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

Ahlcon Parenterals, Alkem Labs,

1 5172

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

Invochem Laboratory, Laurus,

2 5564

What are the inorganic material eliminated in Sulphated Ash

Cipla,

3334

How to Calibrate NMR instrument ?

Reddy Labs,

1 5476

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

Reddy Labs,

1 12206

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 4727

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

Aurobindo,

5 28503

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 7104

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

Reliance,

3390

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 30561

Un-Answered Questions { Chemistry }

For water content determination, if the material is insoluble in methnaol and ethylene glycol mono methyl ether, what other diluent can we use.

2001

What is acid anhydride of h2co3?

1020

How would you describe the orientation of the ligands around the zr center in the homogeneous zirconium catalyst? : Polymer Chemistry

1015

Why a1% value is used for some product ? What is the criteria for selection a1% value ?

2346

What is the principle involved in conductometric titration?

1168

Explain why acetic has less conductivity than hcl?

1039

What are hard waters?

1022

Why irmoisture balance is used for corrugated box moisture testing

2404

Explain what is the chemical formula of detergent?

992

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

2567

Arrange by acidic values : phenol, nitrotolouene and o-cresol?

1083

how you fix the limits of impurities?

837

What is Band broading effect explain

1880

Define Vulcanization?

1171

Why is glass electrode called an ion selective electrode?

1007

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