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Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

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Corrosion

Oxidation of metals in the presence of air and moisture.

Calorimeter

A device used to measure the heat transfer between system and surroundings.

Unsaturated Hydrocarbons

Hydrocarbons that contain double or triple carbon-carbon bonds.

Strong Field Ligand

Ligand that exerts a strong crystal or ligand electrical field and generally forms low spin complexes with metal ions when possible.

Spectrochemical Series

Arrangement of ligands in order of increasing ligand field strength.

Aromatic Hydrocarbons

Benzene and its derivatives.

Condensation

Liquefaction of vapor.

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Rate-determining Step

The slowest step in a mechanism, the step that determines the overall rate of reaction.

Helium

Discovered : by Sir William Ramsay in London, and independently by P.T. Cleve and N.A. Langlet in Uppsala, Sweden in 1895.
Origin : The name is derived from the Greek ‘helios’,sun.
Description :A colourless, odourless gas that is totally unreactive. It is extracted from natural gas wells, some of which contain gas that is 7% helium. It is used in deep sea diving for balloons and, as liquid helium, for low temperature research. The Earth’s atmosphere contains 5 parts per million by volume, totalling 400 million tons, but it is not worth extracting it from this source at present.
Atomic No:2 MAss No:4