Осуществить цепочки превращений:
1) Na->Na2O->NaOH->Na2CO3->NaCl->AgCl
2) S->SO2->SO3->K2S04->BaSO4
3) S->H2S->SO2->Na2SO3->NaCI->AgCl
4) Zn+HNO3(разб)->
5) Zn+HNO3(к)->
6) K+HNO3(разб)->
7) K+HNO3(к)->
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