Chemistry Interview Questions
Questions Answers Views Company eMail

which is the most abundant element in the universe?

2 4273

How we fix the validity period of a Normal solution and re-standardization due date

3 7828

How do you verify the primary,secondary and tertiary amines by IR-Spectroscopy.

GVK,

2 17700

what is the extinction coefficient for Indomethacin or at 319nm wave length.

GSK GlaxoSmithKline,

3490

Sr-90, a radioactive isotope, is a major product of an atomic bomb explosion. It has a half life of 28.1 year. Calculate the first order rate constant for this nuclear decay and the fraction of 90Sr that remains after 10 half lives?

Wipro,

5689

The rate constant for the second order reaction is 0.54/M.s at 300oC. How long (in sec) would it take for the concentration of NO2 to decrease from 0.62M to 0.28 M? 2NO2(g) 2 NO(g) + O2(g)

2136

4 Identify the substance oxidized, reduced, oxidizing agent and reducing agent for the following reactions

MahaGenco,

1983

. Given that 2Hg2+ (aq) + 2 e- Hg22+(aq) E0 =0.92V Hg22+ (aq) + 2 e- 2Hg(l) E0 =0.85V Calculate standard free energy change and K for the following process at 25oC Hg22+(aq) Hg2+ (aq) + Hg(l)

5980

Write the each half cell reaction and also net cell reaction for a cell

2415

Balance the following redox equations by ion electron method. In basic medium (i) CN- + MnO4- CNO- + MnO2 In Acidic medium (ii) ClO3- + Cl- Cl2 + ClO2

Chemical, Wipro,

1 8578

how PH an important role in HPLC separation

3 15561

HOw do i calculate the number of theoretical plate on a HPLC chromatography

Laurus,

2 18651

How we can analysed unknown sample by hplc....

Archimedes,

2 10931

Why the same type of columns showing different RT for a single product?

6 12182

Shall i use a same hplc column for two different products.?

3 8258


Un-Answered Questions { Chemistry }

What is a tripod?

624


What is the difference between fractionation and distillation?

572


hi i am siva icompleted m,sc in organic chemistry in 2008&working as alecturer can u send me the interview qusetions with answers . i expected that i got 135 - 140 marks is there any chance to get selection my interview is on may 7th 2010

1621


A ha tc is actual defination of retention time?

1037


Which products will produce when acetic anhydride reacts with Ter-butanol, Sec-butanol, Iso butanol, Dimethylamine etc.

2364






How many moles of sodium hydrogen phosphate can be prepared from 3 mol of sodium hydroxide and phosphoric acid?

1886


Write the chemical formula for epsom salts?

599


We use hicrome 10 cxs column in hplc analysis....pls tell me.. what is the meaning of 10 cxs?

1123


Why sodium hydroxide used for maintain pH of phosphate buffer

1803


iam usig ph buffers merk. manually how to prepare ?

1757


what is the importence and role of LCMS and LCMS/MS and their applications? which type of compounds are analysis by lcms?

3084


in which situation ion pair require to use?

260


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

1257


what is the difference between elctrefining and electrolysis?

1724


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

1098