Chemistry Interview Questions
Questions Answers Views Company eMail

What is difference between known and unknown impurities

Sun Pharma,

1 1561

What is the difference between Assay and Purity?

968

What is the difference between known and unknown impurities?

1 2317

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

1157

Why we have to add 200mg Na2CO3 in preparation of 0.1N sodium thiosulfate solution?

1122

Why to use propyl paraben in HPLC gradient calibration

Glenmark,

6056

Why potassium dichromate was using in Uv calibration?

1 2714

%lod always grater than %water content for same product??

1 1914

We use Potassium Dichromate solution for the calibration of UV-Visible Spectrophotometer in UV region. My question is to calibrate visible region which solution could be used in photometric accuracy

1303

How to define samples weight in moisture content

1 1701

what is acid and base

1 1437

what is NIR wave length

926

What is AV value in test uniformity content ,describe calculation

Lupin,

1 2256

Why perchloric acid used for potentiometric titration

2147

What is differences between the Instrument and Equipment

Aurobindo,

2 2720


Un-Answered Questions { Chemistry }

Explain the chemical formula for dichromate?

574


Why do we use vaccum in Loss on drying test?

1199


Name the element which has the following ground-state electron configuration: 1s22s22p6?

559


Comosition of bell metal

1287


Explain the process of protactinium-uranium fractionation and its implications for understanding geological and geochemical processes.

156






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

584


Describe your field experience sample type collected,sample techniques,field measurements taken and equipment used?

2267


Give an example of a polysaccharide?

635


how you start the solubility study?

331


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

1346


What is third generation HPLC Columns?

1493


why require the ph, buffer during hplc mobile phase?

392


Explain why acetic has less conductivity than hcl?

577


in api coa contains only process impurities and in product coa contains degradation impurities?

312


Why is estimation of copper done at 620 nm wave length?

927