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Technical Interview Questions - 10 Chemistry Special blog contains questions about Valancy, Radical,  molecule, organic compound,  inorganic compound, Crude oil composed of, classifying hydrocarbon,

101. What is Valency? What is the valance of carbon atom?
102. What is Radical?
103. What is a molecule?
104. What is organic compound?
105. What is inorganic compound?
106. What is Crude oil composed of?
107. How many different types of crude are there in the world?
108. What is the basis of classifying hydrocarbon?
109. What the major hydrocarbon families’ deal within refinery/petrochemical processing mainly?
110 . How we are getting petro products? What are main fractionation products from Petroleum?

101. What is Valancy? What is the valance of carbon atom?

Valancy is combining capacity of an atom. The number of electrons, gained, lost or shared by an atom is the valance. Carbon atom has a valance of four.

102. What is Radical?

A radical is a group of atoms different elements are linked together in chemical reactions. A radical behaves like a single atom.

103. What is a molecule?

Molecules are the smallest parts of compounds, some elements like Hydrogen, Nitrogen, Oxygen, etc., exist as molecules of two atoms.

H2, N2, O2

104. What is organic compound?

Organic compounds are obtained directly or indirectly from living organisms,. Since carbon compounds are the most important compounds of plants and animals, organic chemistry is the chemistry of carbons compounds.

105. What is inorganic compound?

Inorganic means 'no life' and inorganic chemistry concerns itself with the elements and compounds other than those of carbon.

106. What is Crude oil composed of?

Crude oil is mainly a mixture of hydrocarbon compounds of carbon and hydrogen. It also contains relatively small quantities of sulfur, oxygen and nitrogen.

107. How many different types of crude are there in the world?

There are hundreds of different crude oils, perhaps even thousands. Some crude oils have lighter specific gravities than others, some have lower total sulfur content than others, some can be refined to produce more gasoline than others, and some have lower pour points than others. 

The physical properties of any specific crude oil are obtained by a series of laboratory tests which result in what is called a "crude oil assay". 

Some people classify crude oils as: paraffin base; naphthene base; aromatic base; asphalt base; or mixed base. 

The general elementary composition of crude oil falls within these approximate weight percent ranges: Carbon = 80 to 87, Hydrogen = 11 to 14, Nitrogen = 0.2, and Sulfur = 0 to 3.

108. What is the basis of classifying hydrocarbon?

On the basis of Chemical structure.

109. What the major hydrocarbon families’ deal within refinery/petrochemical processing mainly?

  • PNAO
  • Paraffins,
  • Naphthenes,
  • Aromatics and
  • Olefins.

(Of these all but Olefins are found in natural crude)

110 . How we are getting petro products? What are main fractionation products from Petroleum?

The manufacture of petroleum product is the separation of crude oil into the main fractions by distillation.

Fractionation products from Petroleum

  • Gas
  • Naphtha (benzene)
  • Kerosene (paraffin)
  • Diesel
  • Lubricant
  • Fuel oil

Thanks for reading - Technical Interview Questions - 10 Chemistry Special
Naitik Patel
Industrial Guide

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