Did you observe that the gold jewelry losses it weight after polishing, why?

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Solution

Gold is an inert metal. It does not react with acid generally. But when dipped in Aquaregia, gold reacts with it and there is reduction in its weight.
Aquaregia $⟶ H N O_{3} + 3 H C l 1 : 3 ⟶ N O C l + H_{2} O + C l N a s c e n t C h l o r i n e$
Gold reacts with this Nascent chlorine and loses some weight.

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Did you observe that the gold jewelry losses it weight after polishing, why?

Gold is an inert metal. It does not react with acid generally. But when dipped in Aquaregia, gold reacts with it and there is reduction in its weight.Aquaregia ⟶HNO3+3HCl1:3⟶NOCl+H2O+ClNascentChlorineGold reacts with this Nascent chlorine and loses some weight.