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据统计世界上每年因生锈损失的钢铁约占年产量的四分一，同学为探究铁的锈蚀条件，设计了如图所示的装置，在一个小烧杯中放入一铁钉，使其一半置于水面以下，一半置于空气中．请回答： （1）铁钉最易生锈的部位是（填a、b、c）______．理由是______． （2）工业上常用稀硫酸对生锈的铁制品进行酸洗除锈，请写出稀硫酸与铁锈反应的化学方程式：______．
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