Дана схема превращений:MnO2+X→MnCl2+ Y→MnS. Определите вещества X и Y.

1) X – KCl, Y – H2S

2) X – CuCl2, Y – (NH4)2S

3) X – Cl2, Y – CuS

4) X – HCl, Y – Na2S

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