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# Among the following the wrong one is

$(a)\;\text{Calamine and siderite are carbonates are oxides } \\(b)\;\text{Argentite and cuprite .} \\(c)\;\text{Zinc blende and iron pyrites are sulphides} \\ (d)\;\text{Malachite and azurite are ores of copper}$

Cuprite is $Cu_2O$ and Argentite is $Ag_2S$.
Hence b is the correct answer.