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有4种钠的化合物W、X、Y、Z，它们之间存在如下关系：①W △ X+H 2 O+CO 2 ②Z+CO 2 →X+O 2 ↑③Z+H 2 0→Y+O 2 ↑④X+Ca（OH） 2 →+CaCO 3 ↓ 试回答下列问题： （1）W、X、Y、Z的化学式分别是：W______、X______、Y______、Z______． （2）以上4个化学反应，属于氧化还原反应的是______（填反应序号），反应中氧化剂是______（写化学式），还原剂是______（写化学式）． （3）若反应④在溶液中进行，写出其离子方程式以及能用该离子方程式表示的另一个化学反应的化学方程式：①离子方程式______②化学方程式______．
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