2026 · Q67
Upon adding hydrochloric acid in copper oxide, it turns to blue-green color which is due to the formation of
General KnowledgeChemistry
- ACopper hydrochloride
- BCopper (II) chloride
- CCopper (I) chloride
- DCopper (I) hydride
Explanation
Copper oxide reacts with hydrochloric acid: CuO + 2HCl -> CuCl2 + H2O. The blue-green colour is due to copper(II) chloride. Copper(I) chloride is white and copper hydrides/hydrochlorides are not formed here. The answer is (B).