WebSep 18, 2024 · Gold is used to make jewellery because (a) it is dull (b) lustrous and attractive (c) highly reactive (d) very cheap 6. The most abundant elements in the … WebPlatinum, gold and silver are used to make jewellery because the metals used in jewellery are always be chosen on the basis of its reactivity. It should be unreactive so that the metal does not tarnish. ... Mar 27, 2024 · Gold is used to make jewelry because of the attractiveness of its luster and because of its rarity. It also doesn't tarnish ...

a Give reason why platinum, gold and silver are used to make jewellery?

WebAlloys of gold with silver or copper are used to make gold coins and goldware, and alloys with platinum or palladium are also used in jewelry. The content of gold alloys is expressed in 24ths, called karats; a 12 … WebPure gold, which contains no other metals, is termed 24-karat gold. So, a 50/50 alloy, half pure gold and half other metal or metals, is 12-karat gold. Alloys used in jewelry … ck 検査 病名 レセプト

Which chemical is used by Jewellers? - scienceoxygen.com

WebClick here👆to get an answer to your question ️ Give reasons.(a) Platinum, gold and silver are used to make jewellery.(b) Sodium, potassium and lithium are stored under oil.(c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.(d) Carbonate and sulphide ores are usually converted into oxides during the process of … WebA piece of jewellery with around 37.5% will be hallmarked as 9-karat gold while a piece that is 24-karat gold will have over 99.9%. 24-karat gold will rarely be used for jewellery … WebJul 13, 2024 · 1. It must meet minimum purity standards. If the jewellery you make and sell is described as 9ct gold or 18ct gold, then it must include at least that amount of pure gold in the alloy. The minimum quantity of gold in items described as 9ct gold is 375 parts per thousand, while 18ct gold must have 750 parts per thousand. 2. c&k 楽譜 ピアノ 無料