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1. When hydrogen sulphide gas is passed through a blue copper sulphate solution, a black precipitate of copper sulphide is received, and sulphuric acid forms remain in the solution. The reaction is an example of ___________ reaction.
2. \(Zn\) + \(CuBr_2\) → \(ZnBr_2\) + \(Cu\) is a __________ .
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