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H2 i2. PBS 2s h2s pb2+. Pb2+ + 2 i− = pbi2. PB+2i=PBI. Pb2 2i pbi2.
PBS 2s h2s pb2+. Pb2+ + 2 i− = pbi2. PB+2i=PBI. Pb2 2i pbi2.

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