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 d-block elements are called outer while f-block elements are called inner transition elements?????????

3 16070

What is the difference between cracking, pyrolysis, destructive distillation, hydroforming, carbonization and dry distillation?

9809

Why don't electrons repel each other during the formation of bond?????????

1 6941

What is the difference between an ion and a radical?????

3 15063

Define:minerals and ores

2579

When a glass rod is heated gradually and suddenly dipped in cold water, it cracks. What is the reason????????? When a cool glass rod is suudenly heatd, it cracks. Why?????????

3 7890

Explain Thiele's structure for benzene. What is the difference between thiele's structure and modern structure (resonance hybrid) of benzene?

5229

In describing structure of benzene, by molecular orbital treatment, either MOT or VBT explains its structure?

2 5706

What is conjugated system?

3 6287

What is the mechanism for sulphonation of benzene by oleum?

1 7391

What is the structure of CO2 and CO?

Aptuit Laurus, Eisai,

4 8736

What is the effect of halogen on reactivity of benzene ring and what is the reason for decreasing reactivity?

3 7857

What are the least number of pi electrons possible in an aromatic compound.

3 6358

What is difference between anti-aromatic and non-aromatic compounds?

5 21803

Which organic compound is used as a fuel in jet air crafts? a. 100 octane b. 90 octane c. Kerosine oil d. Diesel oil

4 7869

Un-Answered Questions { Chemistry }

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

705

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

1874

in which situation ion pair agent require to use?

744

for which product require to do content uniformity? what is limit of cu?

821

if you have given one product then how you determine the impurity in that?

747

How to determine the EDTA content by potentiometry titration in Ceftriaxine sodium

2550

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

577

Explain what is meant by "c2 symmetry" and "mirror plane symmetry". Can a molecule with "mirror plane symmetry" ever be chiral? : Polymer Chemistry

1027

What is viod volume and peak purity in HPLC?

2884

Define a triglyceride?

1018

what you do when compound having dwel wavelength?

753

What is titration?

1118

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

1120

Why perchloric acid used for potentiometric titration

2685

in dissolution if one bowl got 70 percent 2nd bowl got 80 percent and 3rd bowl got 90 percent then how proceed?

759

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