When copper sulfide is treated with hydrochloric acid it gives off a gas _____ which has a foul smell

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Solution

Copper sulfide (CuS) when treated with hydrochloric acid (HCl) it results in the production of copper chloride (CuCl₂) and hydrogen sulfide (H₂S) gas.
CuS(s) + 2HCl(aq) $\to$ CuCl₂(aq) + H₂S(g)
Hydrogen sulfide(H₂S) has foul smell. It smells like rotten eggs
Final answer: When copper sulfide is treated with hydrochloric acid it gives off a gas hydrogen sulfide which has a foul smell

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