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

In pharmaceuticals formulation OOS applicable in Raw Material(which is not manufacturing in the company. and purchase by approved vendor)).Why?

Orchid,

1 9019

Is LOD and LOQ values differ for different substrat (eg milk, tissue, egg etc.) for same compound (eg pesticide flumethrin)in same instrument(eg GC)?

Pharmaceutical,

1 4648

Can we use water in process (Intermediate stage) during phase -I validation of water system.

GSK,

1 5328

Can we use Poteble water in process ? How

1 4563

why we use only six bowls for dissolution of a drug

Cipla, Natco, TelePerformance,

1 21636

On which pharmacopoeia basis we can calibrate instruments like HPLC,GC,UV,DISSO,IR etc...

Cipla, Laurus, Micro Labs,

9 25703

why PH range 0-14 explain

DRL, Reddy Labs, Saint Gobain, Viva,

5 65210

What is the difference between QA & QC ?

Optimus,

5 25027

How to make up 100ml of a solution cintaining compound A at 95µg/ml and compound B at30µg/ml for an HPLC reference standard.

3 7709

why we prefer kbr for ftir than kcl?

Aurobindo,

5 14406

How do we quantify crystaline and amarpous forms by using (NMR, XRD)spectroscopic techniques? Which any others instruments are useful for this quantification? explain

Graviti Pharmaceuticals, Vimta Labs,

2389

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

2636

in dissolution in one tablets two molecule one is losartan & second is HCTZ losartam is complies in s1 stage & hctz is complies in s2 stage then how to report result losartan s1 stage result or losartan s2 stage result

Dishman,

1 2802

why we use polystyrene film for ftir calibration?

Rakshit Drugs,

4 19255

when we covert any substance into vapour state from solid state, is it ionized or not?

2 5041

Un-Answered Questions { Chemistry }

how you confirm the assay method?

770

How require to develop GC method? how to select diluent, GAS, column selection and other chromatographic conditions?

734

Hi sir if any product monograph not given known impurities (may be 5 impurities) specifications then how we require to proceed for inhouse formulation?

705

Define a hydrogen bond?

1031

Why graphite rod is used in nuclear reactor?

1029

Differentiate between modern periodic table and mendeleevs table?

1167

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 ?

3667

The rate constant for the second order reaction is 0.54/M.s at 300oC. How long (in sec) would it take for the concentration of NO2 to decrease from 0.62M to 0.28 M? 2NO2(g) 2 NO(g) + O2(g)

2597

we can use expired sample for validation and analyst qualification?

810

What is blank solution?

1088

why we are using benzene, anyline in acetic anhdride assay titration method?

2114

How can we find that which type hybridyzation in perticular compound like in CH4(hy is sp3)?

1102

Explain why do some medications contain hcl?

1148

How is the viscosity of liquid related to its mobility?

1436

An atom has 18 protons and 22 neutrons. Tell me its mass number?

993

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