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同学们在做实验时发现，将镁条放入某CuCl₂溶液中，镁条表面有气泡产生。对于这一异常现象产生的原因，同学们设计了以下探究方案进行讨论。其中没有意义的是（ ）

A.甲同学推测该气体可能是H₂，并收集气体用点燃法检验

B.乙同学猜想该CuCl₂溶液呈酸性，并用pH试纸检测

C.丙同学用锌粒与该CuCl₂溶液反应，观察是否有气泡产生

D.丁同学用镁粉与该CuCl₂溶液反应，观察产生气泡的快慢