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Chemistry Interview Questions
Questions Answers Views Company eMail

why we get only one peak in assay by hplc but in rs by hplc get more peaks

MSN Pharma,

1 11585

In performance Check of GC Why Hexadecane Peak is Considered 

Asian Paints, MSN Pharma,

3112

Is it required to inject 6 injections for % RSD of a system suitability in lc or gc

Raks Pharma,

3 13910

Why do we use KCl ,K2Cr207,Toulene & Halonium oxide for the caliberation of UV

Apotex,

2 16530

what is rt and rrt? how we find rrt? relation between rt and rrt/

Cadila,

1 19445

why the ph scale range is 1 t0 14 and why not beyond 14 and not to below 1?

Avra, Granules, Orchid,

5 22221

What is method validation in quality control

Alchem,

1 5139

Why we use uracil and caffeine in hplc calibration

Alchem, Reddy Labs,

6 30215

hplc assay limit 98.0 to 105 why

Aurobindo, Hetero,

2 14293

uv,ri,pda detactor principles ?

Aurobindo, Mankind, ZCL Chemicals,

1 4579

ex:this product used c18 column but same product used c8 column what happend ?

Hygro Chemicals,

2 6891

HPLC Calibration gradient method why used union ?

Hygro Chemicals,

2 6369

what are stereomers? how are they classified?

MSN, Reddy Labs,

3482

If mass balance is not passing in forced degradation in method validation that method is suitable or not?

Aurobindo, Dr Reddys, Reddy Labs, Wockhardt,

1 9090

Why we compare unequal concentrated solutions in heavy metals test. For example comparing the test solution with 1 ppm lead standard and telling it's less than 20ppm?

Micro Labs, Mistair,

1 7904

Un-Answered Questions { Chemistry }

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

2791

all types of questions asked at the cipla interview

4722

When a glass rod is heated gradually and suddenly dipped in cold water, it cracks. What is the reason?? When a cool glass rod is suddenly heated, it cracks. Why?

1086

How to set analyticl specification for combination products?

802

EXPLAIN THE CALCULATION PART OF AN KF TITRATOR CALIBRATION WITH SUITABLE EXAMPLE

2695

how require to fix the linearity and accuracy cincentration range?

1744

How to choose the which salt is suitable for mobilephase

3304

What is the difference between chromatographic purity and related substances?

1466

Acid value definition is number milligrams of koh required to nuetralise the acid present in one gram oil & fats but why not use naoh for nuetralisation?

1206

why we are using hexane in calibration of number of drop per mL

1799

if you get peak in blank then what require to do?

1027

before starting analytical method valodation what you checking? and how giving preference to start validation?

864

Why we check moisture,ash & AIA in product

1946

What is edta?

1132

Is napthalene aromatic?

1423

For More Un-Answered { Chemistry } Questions Click Here