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【简答题】
（8分）过氧化氢（H 2 O 2 ）是一种无色粘稠液体，其水溶液又俗称双氧水，呈弱酸性，医疗上用作外科消毒剂。研究表明：H 2 O 2 具有立体结构，两个氢原子像在半展开书本的两页纸上，两页纸面的夹角约为94°，氧原子在书的夹缝上，O－H键与O－O键之间的空间夹角约为97° ⑴H 2 O 2 的电子式为 ，⑵经测定，H 2 O 2 为二元弱酸，其酸性比碳酸弱，请写出其第一步的电离方程式_____________。 ⑶H 2 O 2 溶液与一种弱酸的酸性氧化物反应生成强酸，该反应的离子方程式为 ，并在方程式上标出电子转移的方向与数目。 ⑷为了贮存、运输、使用的方便，工业上采用“醇析法”将其转化为固态的过碳酸钠晶体（其化学式为2Na 2 CO 3 ·3H 2 O 2 ），该晶体具有Na 2 CO 3 和H 2 O 2 的双重性质。则下列物质能使过碳酸钠较快失效的是（多选） 。 A．MnO 2 B．H 2 S C．稀H 2 SO 4 D．NaHCO 3
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