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【简答题】
已知草酸(H 2 C 2 O 4 ) 在加热条件下的反应为H 2 C 2 O 4 CO↑＋CO 2 ↑＋H 2 O。现用下图甲、乙装置(图中a，b为活塞开关，分离、干燥前未打开)，对生成的CO和CO 2 。供选用的试剂有稀硫酸、浓硫酸和氢氧化钠溶液。 (1)甲中盛放______，盛放______ ，其作用是______ (2)首先，打开活塞a，让混合气体通过甲、乙装置，能分离出来的气体是______。此时甲装置中发生反应的化学方程式是___ ___ (3)要分离出另一种气体，则丙中应盛装____ __，其分离操作方法是 ，该气体可用___ ___法收集。此时甲装置中发生反应的化学方程式是______ (4)有一名同学想测定分离出来的CO气体的体积，请帮助该同学从上图A，B，C 3个装置中选择一个合理的量气装置______ 。
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