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When a copper vessel is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of

$\begin{array}{1 1} \text{a) Copper oxide and Copper Nitrate } \\ \text{ b) Copper hydroxide & Copper Carbonate} \\ \text{ c) Copper carbonate and Copper sulfate } \\ \text{ d) Copper hydroxide and Copper Nitrate} \end{array} $

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