Properties of Gold:
Physical properties:
1) Gold is the lustrous yellow metal that melts at 1063°C to a green liquid and boils at 2610°C.
2) It is the most malleable and ductile of all metals.
3) It is a good conductor of electricity and heat.Chemical properties:
1) Gold is not affected by dry or moist air or oxygen.
2) Alkalies contain no action on gold.3) With Aquaregia:
Gold dissolves in aquaregia (i.e., three parts of con.HCl + one part of con.HNO3) to form auric chloride.
2Au + 9 HCl + 3HNO3 → 2AuCl3 + 6H2O + 3NOCl Auric chloride Nitrosyl chloride4) With chlorine:
At 200°C, gold is eagerly attacked by chlorine generating auric chloride.
2Au + 3Cl2 → 2AuCl3
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Disconnect the supply cables at the motor’s terminal box, separate the motor from the driven machine, detach the foundation bolts or nuts and eliminate the motor to the maintenance shop.
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