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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 11512

In performance Check of GC Why Hexadecane Peak is Considered 

Asian Paints, MSN Pharma,

3044

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

Raks Pharma,

3 13752

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

Apotex,

2 16409

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

Cadila,

1 19269

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

Avra, Granules, Orchid,

5 22002

What is method validation in quality control

Alchem,

1 5011

Why we use uracil and caffeine in hplc calibration

Alchem, Reddy Labs,

6 29940

hplc assay limit 98.0 to 105 why

Aurobindo, Hetero,

2 14125

uv,ri,pda detactor principles ?

Aurobindo, Mankind, ZCL Chemicals,

1 4474

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

Hygro Chemicals,

2 6770

HPLC Calibration gradient method why used union ?

Hygro Chemicals,

2 6259

what are stereomers? how are they classified?

MSN, Reddy Labs,

3408

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 9002

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 7825

Un-Answered Questions { Chemistry }

What modification is required for the atomic theory in order to explain the existence of isotopes, and modern view of atomic nuclei and electrons?

2256

we shall use Dichloromethane in last stage of API.

3088

How is the accuracy of the method determined?

1108

What is chemical oxygen demand?

1058

WHAT IS THE PURPOSE WE USE HCL, CHOPPER, BURNER, MONOCHROMATOR in AAS? PLEASE EXPLAIN BRIEFLY

2607

Define chemical corrosion. What are the types of chemical corrosion? : Electrochemistry Corrosion

1010

What is the difference between cracking, pyrolysis, destructive distillation, hydroforming, carbonization and dry distillation?

9806

WHAT TYPE OF QUESTION ASK FOR POST SENIOR TECHNICAL ASSISTANT IN DRDO

8088

What is the function of diethyl amine?

1105

How can be set a responds factor for evaluating a unknown impurity by HPLC

2407

What is a potentiometer titration?

1193

if you have given one product then how you determine the impurity in that?

740

How can Protactinium isotopes be used in the creation of neutron-rich targets for various experiments and studies?

719

Mention a few advantages of photoelectric colorimetric determination.

1382

How many moles of sodium hydrogen phosphate can be prepared from 3 mol of sodium hydroxide and phosphoric acid?

2395

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