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下述实验能达到预期目的的是 [ ] 实验内容 实验目的 A. 将SO2通入溴水中 验证SO2具有漂白性 B. 将乙醇与浓硫酸共热制得的气体直接通入酸性KMnO4溶液中 检验气体中含有乙烯 C. 淀粉溶液和稀H2SO4混合加热,冷却后,再加新制的Cu(OH)2悬浊液加热 至沸腾检验淀粉水解产物有还原性 D. 在滴有酚酞的Na2CO3溶液中,加入BaCl2溶液后红色褪去 验证Na2CO3溶液中存在水解平衡
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