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    【题目】小华的妈妈买了一个黄金手镯，小华想通过实验来证实这个手镯是不是用铜锌合金制成的仿制品，他不能选用的试剂是( )

    A．MgCl2 B．H2SO4

    C．AgNO3 D．CuSO4

    【答案】A

    【解析】锌铜的金属活动性比镁弱，故锌铜都不能与MgCl2溶液反应，无法证明。

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