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 pH Range has been fixed as 0 to 14 ?

Akums, Cipla, Matrix, SUN,

1 7562

How you develop a method in HPLC?

CU, Perrigo, Wockhardt,

2670

what can saybolt viscometer do?

1 8470

why using buffers in hplc inteed of water

5 14679

How long we can use hygroscopic reference standard in terms of water absorb.I mean in line with respective monograph's specification or more than that?

1 3202

Why we use methy Ethyl Propylparabine For HPLC Calibration

1 5595

What is use of LOD and LOQ in validtion and give range and in calculation why we use 3.3* LOD here why we use 3.3

Dr Reddys, IPCA, Reddy Labs,

2 6998

In specificity what parametrs are consider why that parametrs

2 7115

ash or residue in that what will be there.

3 6797

How can we determine Moisture content of HI?

Cipla, Reddy Labs,

1 3522

What is difference between oos

Gennex,

7 28460

what is the differance between Analytical and semi micro balance?

2 13931

In the method validation proceedure,lod & loq calculation we use the formulae for LOD=3.3*SD/slope and for LOQ=10*SD/slope,why we use 3.3 & 10 in the formulae?

1 11136

In HPLC Chromatographic separation Resolution equation is Rs = 1.18 (tR2 –tR1)/wh1+Wh2, Where, tR2 and tR1 is run time of eluent ratios of the distances from the point of application to the centers of the spots and the distance travelled by the solvent front from the point of application (retardation factor), and Wh1and Wh2 , is peak width of at half height. What is 1.18 ?

1 7475

what is mean by theoritical plates(not formula) ?

Micro Labs,

4 14982

Un-Answered Questions { Chemistry }

What are the advantages of conductometric titration over visual or potentiometric titration?

1170

on the basis of bcs class how to proceed the solubility?

834

what happens to the unit particles of a solute when it dissolves on a liquid?

2251

Why are the titration involving edta carried out slowly towards the end point?

1247

What is chemical oxygen demand?

1119

What are the two most abundant elements in the universe?

1252

we are performed SOR for a particular product the limit is -6 to -10.We face particular bathes it is not meeting the specification.we performed diffrent instrument diffrent analyst we are getting diffrent diffrent results.solvent is dimethyl sulfoxide what could be the reasion

1928

How hydrate is forming along with API?

2379

write short note on steroids,terpenes,prostagladins,and phospholipids.

6483

What is the bluish white precipitate formed after adding ammonia solution?

1151

How to convert -40 of into centigrade?

1095

Write the equation of photosynthesis?

1165

how you start RS method development when for new product?

780

in api coa analytical method given as Ph Europe which api used in formulation in this api coa method given Ph Europe so for Analytical methic for finished product we require to refer Ph Europe monograph ok n.a.? So any extra impurities which is given in USP monograph of api or finished product need not require to monitor on above case n.a.? but how require to do specificity?

650

what are the guidelines for analytical method validations?

1155

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