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（12分）重铬酸钠（Na 2 Cr 2 O 7 ）广泛用于合成颜料、媒染剂等，以铬铁矿（主要成分为Cr 2 O 3 ，还有FeO、Al 2 O 3 、SiO 2 等杂质）为原料制取重铬酸钠的流程图如下： 请回答下列问题。 ⑴铬铁矿中的Cr 2 O 3 与纯碱、O 2 在高温下反应的化学方程式为 ▲ 。 ⑵若Ⅰ中只用一种试剂调节溶液的pH，用 ▲ （填标号）。 A．稀硫酸            B．氧化钠固体            C．氢氧化钾溶液 ⑶Ⅰ中，调节溶液pH后，如果溶液的pH过小，可能导致W沉淀部分溶解，原因是： ▲ 。（用离子方程式表示）。 ⑷Ⅱ中，Na 2 CrO 4 转化为Na 2 Cr 2 O 7 的离子反应如下： 2CrO 4 2 － （黄色）＋2H ＋ Cr 2 O 7 2 － (橙红色)＋H 2 O ①该反应 ▲ （填“是”或“不是”）氧化还原反应。 ②若往Na 2 Cr 2 O 7 溶液（橙红色）中加入足量NaOH固体，溶液 ▲ （填标号）。 A．变黄色            B．颜色不变        C．橙红色变深 ③已知：25℃，Ag 2 CrO 4 的K sp ＝1.12×10 － 12 ，Ag 2 Cr 2 O 7 的K sp ＝2×10 － 7 。25℃，往Na 2 Cr 2 O 7 溶液中加入AgNO 3 溶液，最终只生成一种砖红色沉淀，该沉淀的化学式是 ▲ 。
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