Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

IN pH CALIBRATION,CALIBRATION IS DONE FOR pH METER OR ELECTRODE?HOW WILL YOU JUDGE THAT THE METER TO BE CALIBRATED WITH 4,7,9.2 BUFFERS?EXPLAIN TEMPERATURE EFFECTS ON pH.

Aurobindo,

1 8408

AT WHAT CONDITIONS WILL YOU ANALYSE A SAMPLE,WHICH ARE PRESERVED AT OTHER THAN THE AMBIENT CONDITIONS?(ie COLD STORAGE SAMPLES BELOW 20* CENTIGRADE?

894

What is a base line?

2 8169




what is differance between density and specificgravaty

Neuland,

2 8406

what is defferance between dipolemoment and polarity

Neuland,

1 5759

In standard weight box used for calibration of analytical balance there are two numbers (Qty) of 20mg, 200mg,2.oGM weights. Why?

Orchid,

2 10976

WHAT IS USE OF ION PAIR REAGENTS?

3 6507

How to calculate signal to noise ratio by this formula 2H/h where h from where and how to measure

2 6475




How to choose the which salt is suitable for mobilephase

Cipla, Ranbaxy,

1746

What is quality controle.

6 7381

What is Standard deviation

Cipla,

2 8483

When you get Moisture content by KF higher than by LOD, what does this indicate?

7 10683

what is deference b/w the working standard and reference standard

4 17796

How do we fix the sample concentaryion in hplc method development. what is the basis?Thanks in advance

Glenmark, Orchid, DRL,

4 13013

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 apperance ? suggest ?

Orchid,

1 4033


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Un-Answered Questions { Analytical Chemistry }

In dissolution of tablets/capsules elaborate the Dissolution limit 20.0% to 60% Q in 30 minutes.

782


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

386


Why only Copper standard is used to calibrate Atomic Absorption spectrophotometer?

1286


is it necessary to do HPLC calibration at wavelength 315nm if we are doing analysis at this wavelangth

626


why should we perform dissolution PVT calibration only by UV spectrometer, not by HPLC ?

415






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?

432


explain 5 components of gas chromatography ?

722


What is the acceptance criteria for moisture balance when calibrated with sodium sulfate

756


are there in uv lamb that is chractrestic for wavelenghth 205 nm ?????

764


Why to use propyl paraben in HPLC gradient calibration

826


what is different when impergnated silica plates are used in separation of azo dyes using column chromatography?

729


What is the principle of Thermal conductivity detector and FID?

1479


Tell me something about Vitamin A test method by HPLC

1404


What is gelatinization?

456


what is lod and loq ?,why use k2cr2o7 , kcl h2so4 in uv calibration ?,why use benzophenone & caffene acetone in hplc calibration ?,what is leading peak in hplc ?why we do the calibration of limit of stry light in hplc & uv ?

2191