能将Na 2 S、Na 2 S0 3 、Na 2 SO 4 、Na 2 S 2 0 3 四种溶液区别开的试剂是()
A.
AgNO 3
B.
BaCl 2
C.
HCl
D.
K 2 Cr 2 O 7
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举一反三
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