Properties of Gold: Gold is the yellow, soft and heavy metal. Gold and Ag are known as noble metals as they are not attacked by atmospheric oxygen. Though, Ag gets tarnished when exposed to air containing traces of H2S . Gold is ductile, malleable, and a good conductor of heat and electricity.
Pure gold is soft in nature. It is alloyed with the Ag or Cu for making jewellery. The purity of gold can be expressed in terms of carats. The pure gold is 24 carats. Gold 14 carats means that it is an alloy of the gold which contains 14 parts by weight of pure gold and 10 parts of copper per 24 parts by weight of the alloy. Therefore the percentage of gold in '14 carats" of gold is = 100/24 * 14 = 58.3%.
Most of the jewellery is made from 22 carat gold (91.66% pure gold). Gold is inert in nature. It does not react with oxygen, water and acids but get easily dissolves in aqua regia
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Oxidation states of Au (gold): The principal oxidation states of the gold are + 1 and + 3 though + 1 state is more stable than + 3.
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