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    【题目】铁制品在通常情况下很易生锈，制造时往往在铁制品表面电镀一层铜起防锈作用，下列说法正确的是（ ）

    A.镀铜铁制品不可在酸性条件下使用

    B.镀铜铁制品可以盛放硝酸银溶液

    C.镀铜铁制品不易生锈的原因之一是使铁隔绝了空气

    D.镀铜铁制品是一种合金

    【答案】C

    【解析】

    试题分析：铜在金属活动性顺序表氢的后面，化学性质稳定，在其中不易锈蚀、与酸不发生反应，但能与硝酸银溶液发生置换反应，因此，镀铜铁制品可以在酸性条件下使用，A错误；铜能置换硝酸银溶液中的银，B错误；铜在空气中不易生锈，铁制品镀铜后，使铁与空气隔绝，防止了的铁的锈蚀，C正确；合金是金属或非金属均匀地熔合在一起，镀铜铁制品铜和铁不是均匀地熔合，不属于合金，D错误。故选C

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