Hydrogen is the lightest element and the most abundant element in the universe.
hydrogen gas is usually from a reduction of a compound containing hydrogen that is in the +1 oxidation state. This reduction is accomplished either electrically or chemically.

Answers

2014-05-06T12:14:47+05:30
Hydrogen is a gas that occupies the first place in the periodic table. it can be prepared by electrolysis of water and upward displacement of air and it is also an useful byproduct of the chlor-alkali process.
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2014-05-06T12:26:00+05:30
Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 1.00794 u, hydrogen is the lightest element. The preparation of hydrogen gas is usually from a reduction of a compound containing hydrogen that is in the +1 oxidation state.
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