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How Do Metal React with Solution of Other Metal Salts

Gold does not...

Question

Gold does not react easily with acid but it reacts with aqua regia. What is aqua regia ? Why does it react with gold?

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Solution

Aqua regia is a solution that is made up of HCl and $H N O_{3}$ combined in a ratio of 3:1 respectively. $H N O_{3}$ being a strong oxidising agent dissolves gold.

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Q. Why HCL and HNO₃cannot dissolve Gold and Platinum alone but their mixture,Aqua-Regia can?

Q. Assertion :Aqua regia dissolves gold, which is insoluble in all other acids. Reason: In aqua regia HCl is a very strong acid and free chlorine is a very strong oxidising agent as it is present in high concentration. Nitric acid reacts with HCl to form nitrosyl chloride NOCl,chlorine and water. Nitrosyl chloride further decomposes to nitric oxide and chlorine. Chlorine dissolves gold oxidizing this metal Au to Au(III)ions forming soluble tetrachloroaurate(III)complex.

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How Do Metal React with Solution of Other Metal Salts

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