Выберите пары, в которых вещества взаимодействуют между собой с образованием осадка.

1) CaCl2 и HNO3
2) HBr и Ba(OH)2
3) Ba(NO3)2 и K2CO3
4) CuCl2 и NaOH
5) BaCO3 и HCl
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