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

how to get accurate result for Residue on evaporation in purified water

1582

(CH2)n + nO2. ---->Co2 + nH2O + energy what is this mean with details

1586

Why acetonitrile and water are used as extraction solvent when analysis melamine? I thought they are miscible and won't be able to separate...

1634

In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?

1911

could negative ions be produced by bombardment process in mass spectrometry?

1723

A ha tc is actual defination of retention time?

1555

Does domestic/household used kerosene oil which is available in blue color (In India) can change its color over the due course of time say 8-10 years if keeping in plastic bottle? If so, in which color it will be turned to change, yellow or transparent or any other color. Please provide me the reply with strong technical approach. Since it has been asked during an interview. Please reply fast. I will be thankful to you if anyone can provide the supporting journals/write-ups/reference to favour of response.

1368

How to check hplc detecter sensitivity?

Gland Pharma,

1 2207

(0.41)d what is d?

Gland Pharma,

1 2756

How to estimate potassium?

1 2064

1.What is the difference between method validation and method verification 2.Which guidelines proposed to method transfer

Granules,

1792

My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards

1549

what is peak purity and its formula

1 2276

Why potassium dichromate is used in calibration of uv?

1924

Why sometime potassium ortho phosphate mix with acetone use for sample preparation for hplc

1419

Un-Answered Questions { Chemistry }

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

630

why is their exotherm while addition of reducing agents in reduction reaction?

2292

Explain the differences between organic and inorganic chemistry?

1047

What is equivalent conductivity?

1138

SET Examination Previous Questions

3626

Tell me how many significant figures are there in the number 0.0036?

994

What is edta?

1016

What is the purpose of octyl silane columns?

4249

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

1053

In pickling process of titatium with HCL . how to know if the acid is not effective after pickling several batch. is there any test to know it. (not practically)

1620

Give the principle of potentiometer titration.

977

why athanol-water mixtuere have maximum viscocity in wt% 40?

1680

please explian me about area normalisation method,diluted standard method,impurity vs impurity and which one has to be selected in method development

1577

if you given one product then which tests you will perform?

665

How to set analyticl specification for combination products?

689

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