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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 16015

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

Apex,

3 18317

What is the difference between kf  and LOD

Enaltec Labs,

5 22661

What is chiral and why this performing in HPLC

Hetero, Macleods,

4 20850

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

Alkem Labs,

3360

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

Ahlcon Parenterals, Alkem Labs,

1 5260

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

Invochem Laboratory, Laurus,

2 5674

What are the inorganic material eliminated in Sulphated Ash

Cipla,

3392

How to Calibrate NMR instrument ?

Reddy Labs,

1 5558

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

Reddy Labs,

1 12292

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 4848

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

Aurobindo,

5 28732

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 7186

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

Reliance,

3442

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 30776

Un-Answered Questions { Chemistry }

explain sour gas?

1116

what is the syllabus for mahagenco recruitment drive for the post of chemist

3332

How to caluclate %w/v& %w/w ple give examples solids&liquids 10%NAOH W/W 10%W/V- 20%HCL W/W &W/V

2560

What is si unit of viscosity-coefficient?

1173

Ph meter can show more than 14 ph reading? Why ph range in between 1 to 14 only?

802

What is the role of stannous chloride?

1427

Explain what are enzymes?

1224

Which Formula Forms A Link Between The Thermodynamics And Electro Chemistry?

1187

Consider the polymerization of vinylidene chloride, ch2=ccl2. What structural variations are possible in poly(vinylidene chloride)? : Polymer Chemistry

1568

why Nacl solution called as brine solution?

3849

composition of gun metal

2162

What is the composition of Barford Reagent?

2192

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

1069

Why use only methanol,used determinationof moisture content not use other solvents

1461

Why we use DPPH in ESR and DPH in fluorescence spectroscopy?

2652

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