Yes, galena (lead sulfide) does not react readily with acids due to its low reactivity. Only strong oxidizing acids like concentrated nitric acid may slowly react with galena to produce lead oxides and sulfur dioxide gas.
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Yes, galena (lead sulfide) does react with hydrochloric acid to produce lead chloride, hydrogen sulfide gas, and elemental sulfur. The reaction can be represented as: PbS + 2HCl -> PbCl2 + H2S + S. However, this reaction is not as vigorous compared to reactions with other metals.
One way to distinguish copper from galena is by conducting a streak test. Galena will leave a gray-black streak, while copper will leave a reddish-brown streak. Additionally, you can perform a simple acid test – copper will not react with hydrochloric acid, while galena will produce hydrogen sulfide gas when exposed to the acid.
Germanium does not react with hydrochloric acid at room temperature. However, it can react with hydrochloric acid when heated, forming germanium chloride.
Hydrogen does not react with water. In an acid, hydrogen can react to form hydrogen gas and a salt.
Gold does not react with nitric acid because it is a noble metal that is resistant to acid attack.