Chemistry Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

General Chemistry (478)
Chemistry AllOther (190)

Chemistry Interview Questions

Questions Answers Views Company eMail

why we use x terra columns at higher ph ?

Hetero,

2 11439

what is dead time in hplc?

Orchid,

3 19531

what is the difference between melting range & melting point? Which is more significant?

5 31027

what is the significant of pH in HPlc?

Orchid,

5 15494

what is weight veriation in pharma industry ? plz explain me

1 3739

How to now that my acid is contact with base or base is contact with acid in drugs, is there any techniq to identify the formation of salt(drug)

Reddy Labs,

3 7594

what is least count of a balance? How we find out this? Any formula for least count of Analytical balance?

Acme Formulation, Analytical Solutions, Dr Reddys, Reddy Labs,

13 98994

Explain about Low pressure gradient and High Pressure gradient systems in HPLC?

Mylan, Orchid, Roshanico,

4 29821

what is protocol ? plz Explain me

5 12929

How can we confirm the HPLC column is end-capped or not? Is it possible to identify by physical appearance?

JBCPL,

3218

HPLC Calibration was done in Reverse Phase, but not in normal phase why explain?

Cipla, Orchid,

11 33636

why silica absorb in mix bed resins in D M plant.

NTPC,

8 22752

i m a m sc biotech student, a chemist in a pvt company for 3 years, i want to change my career. which will be good for me again m sc chemistry in distance, then phd ? or prepare for railway or banking jobs. plz help.i prefer a govt. job ?

1 4114

what are the standard methods for HPLC?

Orchid,

2786

What is the procedure for investigation of an OOS (Out of specification) results?

Biocon, Dr Reddys, Reddy Labs,

4 26309

Un-Answered Questions { Chemistry }

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?

3540

How to do regeneration of Metacarb Pb plus column?

2580

What general group of organic compounds are not oxidesied in the cod test?

1500

Why is the color of the indicator drop remains the same at the end point?

1229

What are common snowflake shapes?

2495

Why is the role of glycerol & naoh?

1073

composition of stainless steel

1827

what is the extinction coefficient for Indomethacin or at 319nm wave length.

4071

why do hard water never produce foam when a soap is dissolved?

1041

why use of sulfuric acid in roi test in pharmaceutical industry

2488

how to prepare for the exam of ongc please give some idea

21966

What is the Difference Between 3M KCL and 4M KCL, WHy We are Filling 3M KCL In electrode Instead of 4M KCL

2541

Active Ingredients in septilin ??

1695

What is weak acid?

964

in DMF having extra impurities and in api COA also having extra imp than USP or BP product then how require to proceed?

836

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