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Which of the following metals will dissolve in nitric acid but won’t dissolve in hydrochloric acid:...

Which of the following metals will dissolve in nitric acid but won’t dissolve in hydrochloric acid: aluminum, copper, or gold? Explain your reasoning in, at most, three sentences.

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Answer #1

copper will dissolve in nitric acid and aluminium will dissolve in Hydrochloric acid but on the other hand gold being highly inert doesnot dissolve in any of these two acids but dissolves in their 1:3 mixture known as aqua regia.The Hcl provides chloride ions to the gold and it forms tetrachloroaurate(III) anions by reacting with the gold cations.

aluminium when react with strong acids like nitric acid gets oxidized and forms an oxide layer of aluminium trioxide which will not allow the acid to react with the metal any further so it will not dissolve.

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