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

While performing TOC sst analysis Zero shift disabled & sample analysis zero shift enabled why?

2863

which one is better separation in high pressure liquide chromatogram orlowpressure chromato gram in hplc

Hetero,

2161

In which cases factor of KF Reaget got higher side

2 6587

Why sucrose used in calibration of polarimeter

Lupin,

1 4504

what is the concept for adjustment of pH in HPLC buffer solution ? a. Common ion effect b. Counter ion effect and explain me, how we adapt this principles & what is the role of these principles in our method

Apex, Pentagon Labs,

1 3489

What is the difference between BD

1 3193

why water content test performed

1 6194

What is peak purity and response factor in chromatographic analysis? Why we required to find out response factor?

2 7360

What are modes of quantification in related substances

Hospira,

2163

what is the source of ir spectroscopy

CTX Life Sciences, Mylan,

2 7505

Difference Between End Cap HPLC Column and Non End Cap Column

2 14692

What precaution u take when doing rs preparing

DRL,

2133

Which type of column should i use to check the purity of high molecular weight protein using HPLC reverse phase column chromatography? Hi everyone. I wanna to check the purity of high molecular weight protein (collagen) with MW of ~130 kDa using a HPLC. I know C18

Petronas, Shanghai Ocean University,

1915

How would you decide dissolution medium for NCE compound of class I drug

2256

which gas is called laughing gas?

2 4864

Un-Answered Questions { Chemistry }

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

1596

how to develop the icp ms method? Application of icp ms?

810

What is stray light in uv what are units for stray light

1652

State beer-lambert’s law.

1145

What is a difference between potency and purity?

1221

What is the diference between residual solvents and organic volatile matter

2053

From where require to take the RLD sample?

756

Besides the extent of branching, can you think of any other structural parameters that might lead to differences in physical properties? : Polymer Chemistry

1305

How does the viscosity vary with temperature?

1084

However ozone is heavier than oxygen still ozone is up there in sky why?

1072

If we have 5 strength which is not dose proportinate and excipients also diffrent in each strength then how we can proceed for Force degradation? and excipient are same but not dose propotinate the how FD?

800

how to calibrate hplc & gc

4510

Consider the polymerization of vinylidene chloride, ch2=ccl2. What structural variations are possible in poly(vinylidene chloride)? : Polymer Chemistry

1507

Tell me about analytical method validation in QC

6181

Protactinium-231 decays to Uranium-235. How is this decay used in radiometric dating and the determination of geological ages?

573

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