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 

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. 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.

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 


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