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

which is the most abundant element in the universe?

2 5420

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

3 9300

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

GVK,

2 18901

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

GSK GlaxoSmithKline,

4071

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,

6249

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)

2597

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

MahaGenco,

2486

. 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)

6644

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

2920

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 9497

how PH an important role in HPLC separation

3 17014

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

Laurus,

2 20067

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

Archimedes,

2 12216

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

6 14114

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

3 10113

Un-Answered Questions { Chemistry }

For limit test of heavy metals in BP, Method C require that the substance is ignited at a temperature not exceeding 800 °C. Why confines such the temperature?

4073

WHICH STANDARD WE USE IN SILICA ANALYSIS IN SILICA-GEL METHOD FOR SOLID SAMPLE

2132

How to caluclate %w/v& %w/w ple give examples solids&liquids 10%NAOH W/W 10%W/V- 20%HCL W/W &W/V

2503

What is split ratio in Gc? Splitless? how requirr to select?

891

What group of elements were called the inert gases?

1119

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

1689

What is the main difference between ODS1 and ODS2 Hplc column.

5219

What is blank solution?

1088

What is the purpose of octyl silane columns?

4290

2321

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

2863

What is an indicator electrode?

1293

Why we are use glass viscometer, and what is calculation manual calculation formula as per USP. How many types of viscometre in glass type viscometer.

2345

What is Band broading effect explain

1880

How require to develop GC method? how to select diluent, GAS, column selection and other chromatographic conditions?

734

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