1.用一种试剂可以鉴别KNO3,KOH,Ba(NO3)2,Na2S四种无色溶液,这种试剂是_________2.ABCDE五种化合物均含同一种元素X,它们在一定条件下发生如下反应:A+O2=B+H2O ,B+O2=C ,C+H2O=D+B ,A+D=E ,E(加热)=X2+C+H2O ,则A,B
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